diff --git a/.trivyignore b/.trivyignore
index c0e23648..62610d3a 100644
--- a/.trivyignore
+++ b/.trivyignore
@@ -39,7 +39,13 @@ CVE-2026-2100 exp:2026-09-01
 # See: UID2-7456
 CVE-2026-56131 exp:2026-08-09
 CVE-2026-56407 exp:2026-08-09
-CVE-2026-56408 exp:2026-08-09
+# CVE-2026-56408 — libexpat (Alpine base image, transitive via eclipse-temurin:21-jre-
+# alpine-3.23) (HIGH).
+# Not exploitable here: Dockerfile FROM eclipse-temurin:21-jre-alpine-3.23; libexpat not apk-
+# added, only libpng/libcrypto3/libssl3/gnutls. Pure-Java Vert.x jar; no expat/JNI/loadLibrary
+# refs in any *.java. XML (logback.xml/conf) parsed by JVM JAXP, not native libexpat.
+# See: UID2-7656
+CVE-2026-56408 exp:2026-11-11
 
 # jackson-core async parser maxNumberLength bypass (GHSA-r7wm-3cxj-wff9) - incomplete fix for
 # GHSA-72hv-8253-57qq. Not exploitable: services only use the synchronous ObjectMapper API, not