fix(deps): update alpine docker tag to v3.23.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
alpine	stage	patch	3.23.3 → 3.23.4

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Renovate PR Review Results

⚖️ Safety Assessment: ✅ Safe

🔍 Release Content Analysis

Alpine Linux 3.23.4 is a security-focused patch release published on April 15, 2026. This update addresses critical vulnerabilities in core system components:

Security Fixes (10 CVEs total):

• musl libc (2 CVEs):

  • CVE-2026-6042: Security vulnerability in musl C library
  • CVE-2026-40200: Stack-based memory corruption in qsort operations on large arrays (affects musl 0.7.10-1.2.6)

• OpenSSL (6 CVEs):

  • CVE-2026-31790, CVE-2026-28387, CVE-2026-28388, CVE-2026-28389, CVE-2026-28390, CVE-2026-31789
  • Affects OpenSSL versions < 3.3.7-r0

• zlib (2 CVEs):

  • CVE-2026-22184, CVE-2026-27171

Nature of Changes:

• This is a patch-level security update (3.23.3 → 3.23.4) following Alpine's stable branch policy
• Alpine Linux only provides security fixes for prior supported releases, no functional changes or breaking changes
• Backward compatibility is maintained per Alpine's release policy
• Updates fundamental libraries (musl, OpenSSL, zlib) that affect virtually every binary on the system

Breaking Changes: None. Patch releases in Alpine maintain backward compatibility.

🎯 Impact Scope Investigation

Usage in Codebase:

• Alpine 3.23.3 is used only in the mise build stage of the Dockerfile (line 1)
• This is an intermediate build stage that downloads the mise binary from GitHub
• The Alpine stage is not part of the final runtime image - the final image is based on ghcr.io/codize-dev/nsjail:latest (Debian bookworm-slim)
• Alpine's role is limited to providing a minimal environment for downloading a single binary via wget

Affected Operations:

1. wget to download mise binary from GitHub releases
2. chmod to make the binary executable
3. The mise binary is then copied to the Debian-based runtime image

Impact on Dependencies:

• No impact on runtime dependencies - Alpine is not used in the final image
• No impact on language runtimes (Node.js, Ruby, Go, Python, Rust, Bash) - all installed in the Debian-based stage
• No impact on nsjail or sandbox execution - runs in Debian environment

CI/CD Status:

• Unit tests: ✅ Passing
• Hadolint: ✅ Passing
• Build: ✅ Passing
• Lint: ✅ Passing
• E2E tests: Pending execution
• Stability days requirement: ✅ Met

Risk Assessment:

• Very low risk - Alpine is only used for a simple file download operation in a build stage
• Security fixes in musl, OpenSSL, and zlib improve the security posture of the build environment
• Even if wget behavior changed (highly unlikely in a patch release), it would only affect the build process, not runtime behavior

💡 Recommended Actions

Immediate Actions:

1. ✅ Merge immediately - This is a security patch with no breaking changes
2. Monitor E2E test results to confirm no unexpected issues (though failures are extremely unlikely given Alpine's limited scope)

No Code Changes Required:

• No application code modifications needed
• No configuration changes needed
• No migration steps required

Post-Merge:

• Rebuild Docker images to incorporate security fixes in the build environment
• No runtime testing required beyond standard CI/CD pipeline

Rationale for Safe Classification:

1. Patch-level update with security fixes only
2. Alpine Linux stable branch policy guarantees backward compatibility
3. Alpine is used only in an intermediate build stage, not in the runtime image
4. Simple use case (wget download) minimizes compatibility risk
5. All automated checks passing
6. Addresses 10 security vulnerabilities, improving overall security posture

🔗 Reference Links

• Alpine Linux 3.23.4 Release Announcement
• Alpine Linux Release Branches
• Alpine Linux Patch Update Policy
• CVE-2026-40200 Details (musl vulnerability)
• Alpine Security Tracker
• PR #63 on GitHub

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