From 3b49f4d3f76fff100bf73f519b4859bc966a3a4f Mon Sep 17 00:00:00 2001
From: chen21019 <19357113+chen21019@users.noreply.github.com>
Date: Fri, 23 Oct 2026 20:00:19 +0800
Subject: [PATCH 1/8] build: refresh October security pins and trust stores

---
 .github/workflows/security-build.yml | 39 ++++++++++++++++++++++++++++
 Dockerfile                           | 20 +++++++++++---
 Makefile                             |  2 +-
 ORIGIN.md                            |  2 +-
 README.md                            |  8 ++++--
 scripts/integration-smoke            |  2 +-
 6 files changed, 64 insertions(+), 9 deletions(-)
 create mode 100644 .github/workflows/security-build.yml

diff --git a/.github/workflows/security-build.yml b/.github/workflows/security-build.yml
new file mode 100644
index 0000000..f0592c9
--- /dev/null
+++ b/.github/workflows/security-build.yml
@@ -0,0 +1,39 @@
+name: Security build verification
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  verify:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 60
+    env:
+      GOTOOLCHAIN: local
+      GOMAXPROCS: 2
+      GOFLAGS: -p=2
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+      - name: Install checksum-pinned Go compiler
+        shell: bash
+        run: |
+          set -euo pipefail
+          curl --proto '=https' --tlsv1.2 --fail --silent --show-error --location \
+            --output "$RUNNER_TEMP/go.tar.gz" https://go.dev/dl/go1.27.3.linux-amd64.tar.gz
+          printf '%s  %s\n' 65efbc80fdc1fa2cd2631cad5b481777a68e8725f34e89f50fc6ac714e379b40 "$RUNNER_TEMP/go.tar.gz" | sha256sum -c -
+          tar -C "$RUNNER_TEMP" -xzf "$RUNNER_TEMP/go.tar.gz"
+          echo "$RUNNER_TEMP/go/bin" >> "$GITHUB_PATH"
+      - name: Validate source and build the updated runtime
+        shell: bash
+        run: |
+          set -euo pipefail
+          test "$(go env GOVERSION)" = go1.27.3
+          make validate test
+          make build smoke integration
+
diff --git a/Dockerfile b/Dockerfile
index 42a6e9e..965d395 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,8 +4,8 @@
 ARG UBUNTU_IMAGE=ubuntu:26.04@sha256:2260313b31c8c011cd2eebe728008efac1b3982be73eb71348ea2648d2c0e09b
 FROM ${UBUNTU_IMAGE} AS tool-builder
 
-ARG GO_VERSION=1.27.0
-ARG GO_SHA256_amd64=675c26c449cbb18fc24b74650de1eabbae6e16f64326fd85a283fb3b58280685
+ARG GO_VERSION=1.27.3
+ARG GO_SHA256_amd64=65efbc80fdc1fa2cd2631cad5b481777a68e8725f34e89f50fc6ac714e379b40
 ARG YQ_VERSION=v4.53.3
 ARG YQ_GIT_COMMIT=1b9b4ac5187171d2e5e3129be0cfa827c7f9d53d
 ARG GOMPLATE_VERSION=v5.1.0
@@ -15,8 +15,8 @@ ARG DOCKER_GIT_COMMIT=055a478ea9010a19d0d4674c0d0e87ade37a4223
 ARG DOCKER_SOURCE_DATE_EPOCH=1776697064
 ARG UBUNTU_SNAPSHOT=20260825T000000Z
 
-ADD --checksum=sha256:6077d27c6b6f8b23590cb01ff877ed8c804a67a5442cc32b5a33da10d2bd0e90 \
-    https://snapshot.ubuntu.com/ubuntu/20260825T000000Z/pool/main/c/ca-certificates/ca-certificates_20260601~26.04.1_all.deb \
+ADD --checksum=sha256:5b6326f1932cfd7be57130561dc78192f09ed9f58bfbe6606ed0c50510c3b6cd \
+    https://archive.ubuntu.com/ubuntu/pool/main/c/ca-certificates/ca-certificates_20260816ubuntu0.26.04.1_all.deb \
     /tmp/ca-certificates.deb
 
 ENV DEBIAN_FRONTEND=noninteractive \
@@ -28,6 +28,7 @@ ENV DEBIAN_FRONTEND=noninteractive \
     GOTELEMETRY=off \
     PATH=/usr/local/go/bin:${PATH}
 
+ADD --checksum=sha256:5b6326f1932cfd7be57130561dc78192f09ed9f58bfbe6606ed0c50510c3b6cd https://archive.ubuntu.com/ubuntu/pool/main/c/ca-certificates/ca-certificates_20260816ubuntu0.26.04.1_all.deb /opt/pasturestack-ca-certificates.deb
 RUN set -eux; \
     mkdir -p /tmp/ca-bootstrap /etc/ssl/certs; \
     dpkg-deb --extract /tmp/ca-certificates.deb /tmp/ca-bootstrap; \
@@ -45,6 +46,11 @@ RUN set -eux; \
         libc6-dev \
         make \
         tar; \
+    dpkg -i /opt/pasturestack-ca-certificates.deb && \
+    update-ca-certificates --fresh && \
+    test "$(dpkg-query -W -f='${Version}' ca-certificates)" = '20260816ubuntu0.26.04.1' && \
+    test ! -e /usr/share/ca-certificates/mozilla/emSign_ECC_Root_CA_-_G3.crt && \
+    rm -f /opt/pasturestack-ca-certificates.deb && \
     rm -rf /var/lib/apt/lists/*
 
 RUN set -eux; \
@@ -114,6 +120,7 @@ COPY --from=tool-builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-ce
 ENV DEBIAN_FRONTEND=noninteractive \
     SYSTEM_IMAGE_PRELOADER_VERSION=${IMAGE_VERSION}
 
+ADD --checksum=sha256:5b6326f1932cfd7be57130561dc78192f09ed9f58bfbe6606ed0c50510c3b6cd https://archive.ubuntu.com/ubuntu/pool/main/c/ca-certificates/ca-certificates_20260816ubuntu0.26.04.1_all.deb /opt/pasturestack-ca-certificates.deb
 RUN set -eux; \
     rm -f /etc/apt/sources.list /etc/apt/sources.list.d/*.list /etc/apt/sources.list.d/*.sources; \
     printf 'Types: deb\nURIs: https://snapshot.ubuntu.com/ubuntu/%s\nSuites: resolute resolute-updates resolute-backports resolute-security\nComponents: main universe restricted multiverse\nSigned-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\nSnapshot: no\n' "${UBUNTU_SNAPSHOT}" > /etc/apt/sources.list.d/pasturestack-snapshot.sources; \
@@ -130,6 +137,11 @@ RUN set -eux; \
         procps \
         sed; \
     rm -f /usr/bin/pebble; \
+    dpkg -i /opt/pasturestack-ca-certificates.deb && \
+    update-ca-certificates --fresh && \
+    test "$(dpkg-query -W -f='${Version}' ca-certificates)" = '20260816ubuntu0.26.04.1' && \
+    test ! -e /usr/share/ca-certificates/mozilla/emSign_ECC_Root_CA_-_G3.crt && \
+    rm -f /opt/pasturestack-ca-certificates.deb && \
     rm -rf /var/lib/apt/lists/*
 
 COPY --from=tool-builder /out/yq /usr/local/bin/yq
diff --git a/Makefile b/Makefile
index b3fcc06..a24858c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 # Created by PastureStack contributors for repeatable validation.
 
-VERSION ?= v0.3.0
+VERSION ?= v0.3.1
 REVISION ?= $(shell git rev-parse HEAD)
 IMAGE_REPOSITORY ?= local/system-image-preloader
 IMAGE ?= $(IMAGE_REPOSITORY):$(VERSION)
diff --git a/ORIGIN.md b/ORIGIN.md
index b257e9e..e1c8e73 100644
--- a/ORIGIN.md
+++ b/ORIGIN.md
@@ -23,7 +23,7 @@ The container build includes separately maintained tools:
 - `yq` `v4.53.3`, built from its verified upstream commit; and
 - `gomplate` `v5.1.0`, built from its verified upstream commit.
 
-The source-built Go tools use Go `1.27.0`. The `gomplate` build updates
+The source-built Go tools use Go `1.27.3`. The `gomplate` build updates
 dependencies with published security fixes while retaining the verified
 `v5.1.0` application source.
 
diff --git a/README.md b/README.md
index 4833de8..5a92235 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ This repository is a derivative maintenance project. It preserves the upstream G
 
 ## Reviewed release
 
-The `v0.3.0` release provides:
+The `v0.3.1` release provides:
 
 - a self-contained public build based on a digest-pinned Ubuntu image;
 - the `system-image-preloader` executable and image name;
@@ -72,7 +72,7 @@ restores the image-presence state. It never performs a broad image prune.
 Use the immutable semantic tag:
 
 ```text
-ghcr.io/pasturestack/system-image-preloader:v0.3.0
+ghcr.io/pasturestack/system-image-preloader:v0.3.1
 ```
 
 The deployment definition must mount `/var/run/docker.sock`, run one instance
@@ -115,3 +115,7 @@ The repository remains under its existing Apache License 2.0 file. The runtime i
 ## Localization
 
 This project is a background service with no user interface or runtime localization subsystem. It therefore does not add locale files. User-facing dashboards that manage this service must provide Traditional Chinese through their own locale framework.
+
+## October 2026 security maintenance
+
+Maintained Go builds select the patched Go 1.27.3 compiler without raising the existing Go language requirement. Ubuntu build/runtime stages apply the checksum-pinned `ca-certificates 20260816ubuntu0.26.04.1` security package after their frozen APT baseline; the final trust store and installed version are verified. Release artifacts must pass the repository's existing checks before publication.
diff --git a/scripts/integration-smoke b/scripts/integration-smoke
index 927a636..f1c1390 100755
--- a/scripts/integration-smoke
+++ b/scripts/integration-smoke
@@ -4,7 +4,7 @@
 set -Eeuo pipefail
 
 PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
-IMAGE="${IMAGE:-local/system-image-preloader:v0.3.0}"
+IMAGE="${IMAGE:-local/system-image-preloader:v0.3.1}"
 TEST_PULL_IMAGE="${TEST_PULL_IMAGE:-ghcr.io/pasturestack/container-cron:v0.6.0}"
 PLATFORM_VERSION="${PLATFORM_VERSION:-v1.6.281}"
 ACCESS_KEY="integration-access"

From 55b0f3cad7507edb6fab2bbca4f54d2810844027 Mon Sep 17 00:00:00 2001
From: chen21019 <19357113+chen21019@users.noreply.github.com>
Date: Fri, 23 Oct 2026 20:09:44 +0800
Subject: [PATCH 2/8] ci: retain exact versioned runtime artifacts

---
 .github/workflows/security-build.yml | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/.github/workflows/security-build.yml b/.github/workflows/security-build.yml
index f0592c9..7655936 100644
--- a/.github/workflows/security-build.yml
+++ b/.github/workflows/security-build.yml
@@ -36,4 +36,20 @@ jobs:
           test "$(go env GOVERSION)" = go1.27.3
           make validate test
           make build smoke integration
+      - name: Retain the exact verified runtime
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p dist/security-runtime
+          docker image inspect local/system-image-preloader:v0.3.1 > dist/security-runtime/images.json
+          docker save local/system-image-preloader:v0.3.1 | gzip -n > dist/security-runtime/images.tar.gz
+          printf '%s\n' "$GITHUB_SHA" > dist/security-runtime/source-revision.txt
+          (cd dist/security-runtime && sha256sum images.json images.tar.gz source-revision.txt > SHA256SUMS)
+      - name: Upload verified runtime and checksums
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: security-runtime-${{ github.sha }}
+          path: dist/security-runtime/
+          if-no-files-found: error
+          retention-days: 14
 

From 680760cbe1a8c9d004ecf802a76fbaaabb52522c Mon Sep 17 00:00:00 2001
From: chen21019 <19357113+chen21019@users.noreply.github.com>
Date: Fri, 23 Oct 2026 20:13:22 +0800
Subject: [PATCH 3/8] build: align security gates and artifact inputs

---
 .github/workflows/security-build.yml | 1 -
 1 file changed, 1 deletion(-)

diff --git a/.github/workflows/security-build.yml b/.github/workflows/security-build.yml
index 7655936..829bdd9 100644
--- a/.github/workflows/security-build.yml
+++ b/.github/workflows/security-build.yml
@@ -52,4 +52,3 @@ jobs:
           path: dist/security-runtime/
           if-no-files-found: error
           retention-days: 14
-

From 79b28a1bf80fee21727eda895e1101daf2ebf83e Mon Sep 17 00:00:00 2001
From: chen21019 <19357113+chen21019@users.noreply.github.com>
Date: Fri, 23 Oct 2026 20:18:07 +0800
Subject: [PATCH 4/8] fix: patch source-built tool HTTP/2 dependencies

---
 Dockerfile | 2 +-
 README.md  | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/Dockerfile b/Dockerfile
index 965d395..8b0cdf2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -80,7 +80,7 @@ RUN set -eux; \
         github.com/go-git/go-billy/v5@v5.9.0 \
         github.com/go-git/go-git/v5@v5.19.0 \
         golang.org/x/crypto@v0.52.0 \
-        golang.org/x/net@v0.55.0 \
+        golang.org/x/net@v0.60.0 \
         google.golang.org/grpc@v1.82.1; \
     go mod tidy; \
     go build -trimpath -buildvcs=false \
diff --git a/README.md b/README.md
index 5a92235..e8c9971 100644
--- a/README.md
+++ b/README.md
@@ -118,4 +118,6 @@ This project is a background service with no user interface or runtime localizat
 
 ## October 2026 security maintenance
 
+The source-built gomplate helper selects `golang.org/x/net v0.60.0` for the October HTTP/2 fixes.
+
 Maintained Go builds select the patched Go 1.27.3 compiler without raising the existing Go language requirement. Ubuntu build/runtime stages apply the checksum-pinned `ca-certificates 20260816ubuntu0.26.04.1` security package after their frozen APT baseline; the final trust store and installed version are verified. Release artifacts must pass the repository's existing checks before publication.

From 03db161c75191229f5f794a30a505dd2860f1454 Mon Sep 17 00:00:00 2001
From: chen21019 <19357113+chen21019@users.noreply.github.com>
Date: Fri, 23 Oct 2026 20:19:01 +0800
Subject: [PATCH 5/8] fix: align x/net transitive module requirements

---
 Dockerfile | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Dockerfile b/Dockerfile
index 8b0cdf2..e874d5f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -79,15 +79,17 @@ RUN set -eux; \
     go get \
         github.com/go-git/go-billy/v5@v5.9.0 \
         github.com/go-git/go-git/v5@v5.19.0 \
-        golang.org/x/crypto@v0.52.0 \
+        golang.org/x/crypto@v0.57.0 \
         golang.org/x/net@v0.60.0 \
         google.golang.org/grpc@v1.82.1; \
     go mod tidy; \
+    test "$(go list -m -f '{{.Version}}' golang.org/x/net)" = v0.60.0; \
     go build -trimpath -buildvcs=false \
         -ldflags "-s -w -X github.com/hairyhenderson/gomplate/v5/version.Version=${GOMPLATE_VERSION} -X github.com/hairyhenderson/gomplate/v5/version.GitCommit=${GOMPLATE_GIT_COMMIT}" \
         -o /out/gomplate ./cmd/gomplate; \
     cp LICENSE /out/licenses/gomplate/LICENSE; \
     /out/gomplate --version; \
+    go version -m /out/gomplate | grep -F 'golang.org/x/net'; \
     rm -rf /src/gomplate /tmp/go-build-cache /tmp/go-mod-cache
 
 RUN set -eux; \
@@ -97,6 +99,11 @@ RUN set -eux; \
         https://github.com/docker/cli /go/src/github.com/docker/cli; \
     cd /go/src/github.com/docker/cli; \
     test "$(git rev-parse HEAD)" = "${DOCKER_GIT_COMMIT}"; \
+    cp vendor.mod go.mod; \
+    cp vendor.sum go.sum; \
+    go get golang.org/x/net@v0.60.0; \
+    go mod vendor; \
+    test "$(go list -m -f '{{.Version}}' golang.org/x/net)" = v0.60.0; \
     CGO_ENABLED=0 \
         GOPATH=/go \
         GO_STRIP=1 \

From 35fbb08a2b7ca5c78207e33a1d0d9e2a57af240c Mon Sep 17 00:00:00 2001
From: chen21019 <19357113+chen21019@users.noreply.github.com>
Date: Fri, 23 Oct 2026 20:36:32 +0800
Subject: [PATCH 6/8] security: scan patched runtimes and publish exact
 verified artifacts

---
 .github/workflows/security-build.yml    | 60 +++++++++++++++++++++++++
 Dockerfile                              |  6 +++
 scripts/install-ubuntu-security-updates | 51 +++++++++++++++++++++
 ubuntu-security-packages.lock           | 32 +++++++++++++
 4 files changed, 149 insertions(+)
 create mode 100644 scripts/install-ubuntu-security-updates
 create mode 100644 ubuntu-security-packages.lock

diff --git a/.github/workflows/security-build.yml b/.github/workflows/security-build.yml
index 829bdd9..6f198e9 100644
--- a/.github/workflows/security-build.yml
+++ b/.github/workflows/security-build.yml
@@ -45,10 +45,70 @@ jobs:
           docker save local/system-image-preloader:v0.3.1 | gzip -n > dist/security-runtime/images.tar.gz
           printf '%s\n' "$GITHUB_SHA" > dist/security-runtime/source-revision.txt
           (cd dist/security-runtime && sha256sum images.json images.tar.gz source-revision.txt > SHA256SUMS)
+      - name: Scan the exact runtime and generate its SBOM
+        shell: bash
+        run: |
+          set -euo pipefail
+          scanner=aquasec/trivy:0.74.0@sha256:62b1e65e8869bc4b4c6aa4fa2b21595256c7c2f6018a9d9ad61caf87187c1969
+          docker pull "$scanner"
+          for runtime in local/system-image-preloader:v0.3.1; do
+            name=${runtime##*/}; name=${name%%:*}
+            docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -v "$PWD/dist/security-runtime:/evidence" "$scanner" image --scanners vuln,secret --severity HIGH,CRITICAL --exit-code 1 --format json --output "/evidence/$name-security.json" "$runtime"
+            docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -v "$PWD/dist/security-runtime:/evidence" "$scanner" image --format cyclonedx --output "/evidence/$name-sbom.cdx.json" "$runtime"
+          done
+          (cd dist/security-runtime && sha256sum -- *.json images.tar.gz source-revision.txt > SHA256SUMS)
       - name: Upload verified runtime and checksums
+        if: always()
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: security-runtime-${{ github.sha }}
           path: dist/security-runtime/
           if-no-files-found: error
           retention-days: 14
+
+  publish:
+    if: github.event_name == 'workflow_dispatch' && github.ref == 'refs/heads/main'
+    needs: verify
+    runs-on: ubuntu-24.04
+    timeout-minutes: 30
+    permissions:
+      contents: write
+      actions: read
+      packages: write
+    env:
+      GH_TOKEN: ${{ github.token }}
+      RELEASE_TAG: v0.3.1
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+      - name: Publish only this run's verified immutable runtime
+        shell: bash
+        run: |
+          set -euo pipefail
+          test "$(git rev-parse HEAD)" = "$GITHUB_SHA"
+          test "$(git rev-parse "refs/tags/$RELEASE_TAG^{}")" = "$GITHUB_SHA"
+          gh run download "$GITHUB_RUN_ID" --repo "$GITHUB_REPOSITORY" --name "security-runtime-$GITHUB_SHA" --dir dist/security-runtime
+          test "$(cat dist/security-runtime/source-revision.txt)" = "$GITHUB_SHA"
+          (cd dist/security-runtime && sha256sum --check SHA256SUMS)
+          gzip -dc dist/security-runtime/images.tar.gz | docker load
+          printf '%s' "$GH_TOKEN" | docker login ghcr.io -u "$GITHUB_ACTOR" --password-stdin
+          trap 'docker logout ghcr.io >/dev/null 2>&1 || true' EXIT
+          : > dist/security-runtime/registry-images.jsonl
+          local_image='local/system-image-preloader:v0.3.1'
+          remote_image="ghcr.io/pasturestack/system-image-preloader:$RELEASE_TAG"
+          if docker manifest inspect "$remote_image" >/dev/null 2>"$RUNNER_TEMP/manifest-error"; then
+            echo "Refusing to replace an existing immutable image tag: $remote_image" >&2; exit 1
+          else
+            grep -Eq 'manifest unknown|no such manifest' "$RUNNER_TEMP/manifest-error"
+          fi
+          docker tag "$local_image" "$remote_image"
+          docker push "$remote_image" | tee "$RUNNER_TEMP/push-log"
+          pushed=$(awk '/digest: sha256:/{for(i=1;i<=NF;i++) if($i=="digest:") print $(i+1)}' "$RUNNER_TEMP/push-log")
+          readback=$(docker buildx imagetools inspect "$remote_image" | awk '$1=="Digest:"{print $2; exit}')
+          test "$pushed" = "$readback"
+          [[ "$readback" =~ ^sha256:[0-9a-f]{64}$ ]]
+          jq -n --arg image "$remote_image" --arg digest "$readback" --arg source "$GITHUB_SHA" '{image:$image,digest:$digest,source:$source}' >> dist/security-runtime/registry-images.jsonl
+          sha256sum dist/security-runtime/registry-images.jsonl > dist/security-runtime/registry-images.sha256
+          gh release create "$RELEASE_TAG" --repo "$GITHUB_REPOSITORY" --verify-tag --title "$GITHUB_REPOSITORY $RELEASE_TAG" --notes "Official security rebuild from $GITHUB_SHA. The release contains the exact tested/scanned runtime archive, SBOMs, and registry digest readbacks. No deployment is included." dist/security-runtime/*
diff --git a/Dockerfile b/Dockerfile
index e874d5f..a2ca11b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -28,6 +28,8 @@ ENV DEBIAN_FRONTEND=noninteractive \
     GOTELEMETRY=off \
     PATH=/usr/local/go/bin:${PATH}
 
+COPY ubuntu-security-packages.lock /licenses/ubuntu-security-packages.lock
+COPY scripts/install-ubuntu-security-updates /usr/local/libexec/pasturestack/install-ubuntu-security-updates
 ADD --checksum=sha256:5b6326f1932cfd7be57130561dc78192f09ed9f58bfbe6606ed0c50510c3b6cd https://archive.ubuntu.com/ubuntu/pool/main/c/ca-certificates/ca-certificates_20260816ubuntu0.26.04.1_all.deb /opt/pasturestack-ca-certificates.deb
 RUN set -eux; \
     mkdir -p /tmp/ca-bootstrap /etc/ssl/certs; \
@@ -51,6 +53,7 @@ RUN set -eux; \
     test "$(dpkg-query -W -f='${Version}' ca-certificates)" = '20260816ubuntu0.26.04.1' && \
     test ! -e /usr/share/ca-certificates/mozilla/emSign_ECC_Root_CA_-_G3.crt && \
     rm -f /opt/pasturestack-ca-certificates.deb && \
+    sh /usr/local/libexec/pasturestack/install-ubuntu-security-updates /licenses/ubuntu-security-packages.lock /etc/ssl/certs/ca-certificates.crt && \
     rm -rf /var/lib/apt/lists/*
 
 RUN set -eux; \
@@ -127,6 +130,8 @@ COPY --from=tool-builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-ce
 ENV DEBIAN_FRONTEND=noninteractive \
     SYSTEM_IMAGE_PRELOADER_VERSION=${IMAGE_VERSION}
 
+COPY ubuntu-security-packages.lock /licenses/ubuntu-security-packages.lock
+COPY scripts/install-ubuntu-security-updates /usr/local/libexec/pasturestack/install-ubuntu-security-updates
 ADD --checksum=sha256:5b6326f1932cfd7be57130561dc78192f09ed9f58bfbe6606ed0c50510c3b6cd https://archive.ubuntu.com/ubuntu/pool/main/c/ca-certificates/ca-certificates_20260816ubuntu0.26.04.1_all.deb /opt/pasturestack-ca-certificates.deb
 RUN set -eux; \
     rm -f /etc/apt/sources.list /etc/apt/sources.list.d/*.list /etc/apt/sources.list.d/*.sources; \
@@ -149,6 +154,7 @@ RUN set -eux; \
     test "$(dpkg-query -W -f='${Version}' ca-certificates)" = '20260816ubuntu0.26.04.1' && \
     test ! -e /usr/share/ca-certificates/mozilla/emSign_ECC_Root_CA_-_G3.crt && \
     rm -f /opt/pasturestack-ca-certificates.deb && \
+    sh /usr/local/libexec/pasturestack/install-ubuntu-security-updates /licenses/ubuntu-security-packages.lock /etc/ssl/certs/ca-certificates.crt && \
     rm -rf /var/lib/apt/lists/*
 
 COPY --from=tool-builder /out/yq /usr/local/bin/yq
diff --git a/scripts/install-ubuntu-security-updates b/scripts/install-ubuntu-security-updates
new file mode 100644
index 0000000..054c893
--- /dev/null
+++ b/scripts/install-ubuntu-security-updates
@@ -0,0 +1,51 @@
+#!/bin/sh
+# Same-series official micro-updates. Never install a package just for a scan.
+set -eu
+test "$#" -eq 2 || { echo 'usage: security-updates LOCK TRUSTED_CA_BUNDLE' >&2; exit 2; }
+lock=$1
+trusted_ca=$2
+. /etc/os-release
+test "$ID:$VERSION_ID" = ubuntu:26.04
+test -s "$lock"
+test -s "$trusted_ca"
+tmp=$(mktemp -d)
+trap 'rm -rf "$tmp"' EXIT HUP INT TERM
+dpkg-query -W -f='${binary:Package}\t${db:Status-Status}\n' | LC_ALL=C sort > "$tmp/before"
+set --
+while IFS= read -r entry || test -n "$entry"; do
+    case "$entry" in ''|'#'*) continue;; esac
+    case "$entry" in *[!a-zA-Z0-9.:+~=_-]*) echo "Invalid lock entry" >&2; exit 1;; esac
+    package=${entry%%=*}
+    version=${entry#*=}
+    test "$package" != "$version"
+    status=$(dpkg-query -W -f='${db:Status-Status}' "$package" 2>/dev/null || true)
+    test "$status" = installed || continue
+    installed=$(dpkg-query -W -f='${Version}' "$package")
+    # A newer base may already contain the fix; never downgrade it.
+    dpkg --compare-versions "$installed" ge "$version" && continue
+    set -- "$@" "$entry"
+done < "$lock"
+if test "$#" -gt 0; then
+    printf 'Types: deb\nURIs: https://snapshot.ubuntu.com/ubuntu/20261023T000000Z\nSuites: resolute-updates resolute-security\nComponents: main\nSigned-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg\nSnapshot: no\n' > "$tmp/security.sources"
+    apt_security() {
+        apt-get -o Dir::Etc::sourcelist="$tmp/security.sources" \
+            -o Dir::Etc::sourceparts=- -o Acquire::https::CaInfo="$trusted_ca" \
+            -o Acquire::https::Verify-Peer=true -o Acquire::https::Verify-Host=true \
+            -o Acquire::AllowInsecureRepositories=false -o APT::Get::AllowUnauthenticated=false \
+            -o Acquire::Retries=5 "$@"
+    }
+    apt_security update
+    DEBIAN_FRONTEND=noninteractive apt_security install -y --only-upgrade --no-install-recommends --no-remove "$@"
+fi
+while IFS= read -r entry || test -n "$entry"; do
+    case "$entry" in ''|'#'*) continue;; esac
+    package=${entry%%=*}
+    version=${entry#*=}
+    status=$(dpkg-query -W -f='${db:Status-Status}' "$package" 2>/dev/null || true)
+    test "$status" = installed || continue
+    dpkg --compare-versions "$(dpkg-query -W -f='${Version}' "$package")" ge "$version"
+done < "$lock"
+dpkg-query -W -f='${binary:Package}\t${db:Status-Status}\n' | LC_ALL=C sort > "$tmp/after"
+# A security micro-update must not add/remove packages or change installed status.
+cmp "$tmp/before" "$tmp/after"
+printf 'UBUNTU_SECURITY_MICRO_UPDATES_OK\n'
diff --git a/ubuntu-security-packages.lock b/ubuntu-security-packages.lock
new file mode 100644
index 0000000..5cf2cd6
--- /dev/null
+++ b/ubuntu-security-packages.lock
@@ -0,0 +1,32 @@
+# Official Ubuntu 26.04 security/updates snapshot: 20261023T000000Z
+# Existing packages only; ABI series and unrelated packages are preserved.
+bsdutils=1:2.41.3-3ubuntu2.2
+curl=8.18.0-1ubuntu2.8
+diffutils=1:3.12-1ubuntu0.1
+gnu-coreutils=9.7-3ubuntu2.1
+gpgv=2.4.8-4ubuntu3.1
+libattr1=1:2.5.2-4ubuntu0.1
+libblkid1=2.41.3-3ubuntu2.2
+libbz2-1.0=1.0.8-6ubuntu0.1
+libc-bin=2.43-2ubuntu2.4
+libc-gconv-modules-extra=2.43-2ubuntu2.4
+libc6=2.43-2ubuntu2.4
+libc6-dev=2.43-2ubuntu2.4
+libcurl4t64=8.18.0-1ubuntu2.8
+libgcrypt20=1.12.0-2ubuntu1.1
+libmount1=2.41.3-3ubuntu2.2
+libperl5.40=5.40.1-7ubuntu0.3
+libsmartcols1=2.41.3-3ubuntu2.2
+libssh2-1t64=1.11.1-1ubuntu0.26.04.4
+libssl3t64=3.5.5-1ubuntu3.7
+libuuid1=2.41.3-3ubuntu2.2
+linux-libc-dev=7.0.0-38.38
+login=1:4.16.0-2+really2.41.3-3ubuntu2.2
+mount=2.41.3-3ubuntu2.2
+openssl=3.5.5-1ubuntu3.7
+openssl-provider-legacy=3.5.5-1ubuntu3.7
+perl=5.40.1-7ubuntu0.3
+perl-base=5.40.1-7ubuntu0.3
+perl-modules-5.40=5.40.1-7ubuntu0.3
+util-linux=2.41.3-3ubuntu2.2
+zlib1g=1:1.3.dfsg+really1.3.1-1ubuntu3.2

From 87cb9b253fbb880621aa593d60771a103bdb6720 Mon Sep 17 00:00:00 2001
From: chen21019 <19357113+chen21019@users.noreply.github.com>
Date: Fri, 23 Oct 2026 20:38:39 +0800
Subject: [PATCH 7/8] ci: scan saved runtime bytes without sharing the Docker
 socket

---
 .github/workflows/security-build.yml | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/security-build.yml b/.github/workflows/security-build.yml
index 6f198e9..dd63984 100644
--- a/.github/workflows/security-build.yml
+++ b/.github/workflows/security-build.yml
@@ -53,8 +53,9 @@ jobs:
           docker pull "$scanner"
           for runtime in local/system-image-preloader:v0.3.1; do
             name=${runtime##*/}; name=${name%%:*}
-            docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -v "$PWD/dist/security-runtime:/evidence" "$scanner" image --scanners vuln,secret --severity HIGH,CRITICAL --exit-code 1 --format json --output "/evidence/$name-security.json" "$runtime"
-            docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -v "$PWD/dist/security-runtime:/evidence" "$scanner" image --format cyclonedx --output "/evidence/$name-sbom.cdx.json" "$runtime"
+            docker save "$runtime" --output "$RUNNER_TEMP/$name.tar"
+            docker run --rm -v "$RUNNER_TEMP/$name.tar:/image.tar:ro" -v "$PWD/dist/security-runtime:/evidence" "$scanner" image --input /image.tar --scanners vuln,secret --severity HIGH,CRITICAL --exit-code 1 --format json --output "/evidence/$name-security.json"
+            docker run --rm -v "$RUNNER_TEMP/$name.tar:/image.tar:ro" -v "$PWD/dist/security-runtime:/evidence" "$scanner" image --input /image.tar --format cyclonedx --output "/evidence/$name-sbom.cdx.json"
           done
           (cd dist/security-runtime && sha256sum -- *.json images.tar.gz source-revision.txt > SHA256SUMS)
       - name: Upload verified runtime and checksums

From abf8b5bfa5596533c9551e147d7dd25c0750076c Mon Sep 17 00:00:00 2001
From: chen21019 <19357113+chen21019@users.noreply.github.com>
Date: Fri, 23 Oct 2026 20:53:44 +0800
Subject: [PATCH 8/8] Patch actual bundled helper module graphs

---
 Dockerfile | 11 ++++++++---
 README.md  |  2 +-
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index a2ca11b..9eea8af 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -69,6 +69,8 @@ RUN set -eux; \
     git clone --branch "${YQ_VERSION}" --depth 1 https://github.com/mikefarah/yq /src/yq; \
     cd /src/yq; \
     test "$(git rev-parse HEAD)" = "${YQ_GIT_COMMIT}"; \
+    go get golang.org/x/net@v0.60.0 golang.org/x/text@v0.42.0; \
+    go mod tidy; \
     go build -trimpath -buildvcs=false -ldflags "-s -w -X github.com/mikefarah/yq/v4/cmd.GitCommit=${YQ_GIT_COMMIT}" -o /out/yq .; \
     cp LICENSE /out/licenses/yq/LICENSE; \
     /out/yq --version; \
@@ -81,10 +83,10 @@ RUN set -eux; \
     test "$(git rev-parse HEAD)" = "${GOMPLATE_GIT_COMMIT}"; \
     go get \
         github.com/go-git/go-billy/v5@v5.9.0 \
-        github.com/go-git/go-git/v5@v5.19.0 \
+        github.com/go-git/go-git/v5@v5.19.2 \
         golang.org/x/crypto@v0.57.0 \
         golang.org/x/net@v0.60.0 \
-        google.golang.org/grpc@v1.82.1; \
+        google.golang.org/grpc@v1.83.2; \
     go mod tidy; \
     test "$(go list -m -f '{{.Version}}' golang.org/x/net)" = v0.60.0; \
     go build -trimpath -buildvcs=false \
@@ -104,7 +106,10 @@ RUN set -eux; \
     test "$(git rev-parse HEAD)" = "${DOCKER_GIT_COMMIT}"; \
     cp vendor.mod go.mod; \
     cp vendor.sum go.sum; \
-    go get golang.org/x/net@v0.60.0; \
+    go get golang.org/x/net@v0.60.0 \
+        github.com/klauspost/compress@v1.18.7 \
+        github.com/moby/go-archive@v0.3.0 \
+        google.golang.org/grpc@v1.83.2; \
     go mod vendor; \
     test "$(go list -m -f '{{.Version}}' golang.org/x/net)" = v0.60.0; \
     CGO_ENABLED=0 \
diff --git a/README.md b/README.md
index e8c9971..b703a68 100644
--- a/README.md
+++ b/README.md
@@ -118,6 +118,6 @@ This project is a background service with no user interface or runtime localizat
 
 ## October 2026 security maintenance
 
-The source-built gomplate helper selects `golang.org/x/net v0.60.0` for the October HTTP/2 fixes.
+The source-built yq, gomplate, and Docker CLI helpers select `golang.org/x/net v0.60.0` for the October HTTP/2 fixes. Their scanned runtime module graph also pins official security fixes: x/text 0.42.0, go-git 5.19.2, grpc-go 1.83.2, klauspost/compress 1.18.7, and moby/go-archive 0.3.0. Upstream helper feature versions stay unchanged; CI exercises the rebuilt helpers and scans the actual final runtime.
 
 Maintained Go builds select the patched Go 1.27.3 compiler without raising the existing Go language requirement. Ubuntu build/runtime stages apply the checksum-pinned `ca-certificates 20260816ubuntu0.26.04.1` security package after their frozen APT baseline; the final trust store and installed version are verified. Release artifacts must pass the repository's existing checks before publication.