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Advisory record · GHSA-4x29-79gh-6v8q

Apache Tomcat util accepted misconfigured CRLs

CVSS 9.1 CriticalCriticalEPSS 0.0059 · 48th percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 29 Jun 2026, 21:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.tomcat:tomcat-utilMaven>=11.0.0-M1, <11.0.23 || >=10.1.0-M7, <10.1.56 || >=9.0.83, <9.0.11911.0.23, 10.1.56, 9.0.119
Identifiers
GHSA-4x29-79gh-6v8q · BIT-tomcat-2026-53434 · CVE-2026-53434
Weakness (CWE)
CWE-390
Tags
Published
29 Jun 2026
Updated
23 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Apache Tomcat's tomcat-util package, in versions 11.0.0-M1 through 11.0.22, 10.1.0-M7 through 10.1.55, and 9.0.83 through 9.0.118, ignores invalid Certificate Revocation Lists configured for an FFM-based connector, so revoked or invalid client certificates may be accepted. The source does not describe the attacker's position or required access. Upgrade to 11.0.23, 10.1.56, or 9.0.119, depending on your release line.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0059, the 48th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.