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Advisory record · GHSA-fpj8-gq4v-p354

Apache Tomcat - Client certificate verification bypass

CVSS 9.1 CriticalCriticalEPSS 0.0029 · 21st percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 17 Feb 2026, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.tomcat.embed:tomcat-embed-coreMaven>=11.0.0-M1, <11.0.15 || >=10.1.0-M1, <10.1.50 || >=9.0.0-M1, <9.0.113 || >=8.5.0, <=8.5.10011.0.15, 10.1.50, 9.0.113
org.apache.tomcat:tomcatMaven>=11.0.0-M1, <11.0.15 || >=10.1.0-M1, <10.1.50 || >=9.0.0-M1, <9.0.113 || >=8.5.0, <=8.5.10011.0.15, 10.1.50, 9.0.113
org.apache.tomcat:tomcat-coyoteMaven>=11.0.0-M1, <11.0.15 || >=10.1.0-M1, <10.1.50 || >=9.0.0-M1, <9.0.113 || >=8.5.0, <=8.5.10011.0.15, 10.1.50, 9.0.113
Identifiers
GHSA-fpj8-gq4v-p354 · BIT-tomcat-2025-66614 · CVE-2025-66614
Weakness (CWE)
CWE-20 · CWE-295
Tags
Published
17 Feb 2026
Updated
11 Sept 2026

Machine-written summary

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

Apache Tomcat versions 11.0.0-M1 through 11.0.14, 10.1.0-M1 through 10.1.49, 9.0.0-M1 through 9.0.112, and 8.5.0 through 8.5.100 are affected, with the tomcat-embed-core, tomcat, and tomcat-coyote packages. A remote client can bypass client certificate authentication on a connector when Tomcat hosts multiple virtual hosts and only one requires it, by sending mismatched host names in the TLS SNI extension and the HTTP Host header. The issue does not apply when client certificate authentication is enforced within the web application. Upgrade to 11.0.15, 10.1.50, or 9.0.113 or later.

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 0.0029, the 21st percentile, on 12 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.