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Advisory record · GHSA-fv25-8xcx-gqjc

Apache Tomcat - WebSocket authentication header exposure

CVSS 7.3 HighEPSS 0.0069 · 53rd percentile

Published by the GitHub Advisory Database at 12 May 2026, 18:30 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<9.0.118 || >=10.1.0-M1, <10.1.55 || >=11.0.0-M1, <11.0.229.0.118, 10.1.55, 11.0.22
org.apache.tomcat:tomcatMaven<9.0.118 || >=10.1.0-M1, <10.1.55 || >=11.0.0-M1, <11.0.229.0.118, 10.1.55, 11.0.22
org.apache.tomcat:tomcat-catalinaMaven<9.0.118 || >=10.1.0-M1, <10.1.55 || >=11.0.0-M1, <11.0.229.0.118, 10.1.55, 11.0.22
Identifiers
GHSA-fv25-8xcx-gqjc · BIT-tomcat-2026-42498 · CVE-2026-42498
Weakness (CWE)
CWE-200
Tags
Published
12 May 2026
Updated
10 Sept 2026

Machine-written summary

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

Apache Tomcat versions 9.0.2 through 9.0.117, 10.1.0-M1 through 10.1.54, and 11.0.0-M1 through 11.0.21 are affected, along with the tomcat-embed-core, tomcat, and tomcat-catalina packages. When a WebSocket request is redirected after authentication, Tomcat's WebSocket client sends the most recent authentication header to the redirect target host, so that host can receive credentials it was not meant to see. Upgrade to Tomcat 9.0.118, 10.1.55, or 11.0.22 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
7.3 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0069, the 53rd percentile, on 10 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.