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Advisory record · GHSA-r6j3-px5g-cq3x

Apache Tomcat Improper Input Validation vulnerability

CVSS 5.3 MediumEPSS 0.059 · 93rd percentile

Published by the GitHub Advisory Database at 10 Oct 2023, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.tomcat:tomcatMaven>=11.0.0-M1, <11.0.0-M12 || >=10.1.0-M1, <10.1.14 || >=9.0.0-M1, <9.0.81 || >=8.5.0, <8.5.9411.0.0-M12, 10.1.14, 9.0.81, 8.5.94
org.apache.tomcat.embed:tomcat-embed-coreMaven>=11.0.0-M1, <11.0.0-M12 || >=10.1.0-M1, <10.1.14 || >=9.0.0-M1, <9.0.81 || >=8.5.0, <8.5.9411.0.0-M12, 10.1.14, 9.0.81, 8.5.94
org.apache.tomcat:tomcat-coyoteMaven>=11.0.0-M1, <11.0.0-M12 || >=10.1.0-M1, <10.1.14 || >=9.0.0-M1, <9.0.81 || >=8.5.0, <8.5.9411.0.0-M12, 10.1.14, 9.0.81, 8.5.94
Identifiers
GHSA-r6j3-px5g-cq3x · BIT-tomcat-2023-45648 · CVE-2023-45648
Weakness (CWE)
CWE-20
Tags
Published
10 Oct 2023
Updated
12 Jun 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 11.0.0-M11, 10.1.0-M1 through 10.1.13, 9.0.0-M1 through 9.0.81, and 8.5.0 through 8.5.93 do not parse HTTP trailer headers correctly. An attacker can send a specially crafted invalid trailer header so that one request is treated as several, enabling request smuggling when Tomcat sits behind a reverse proxy. Upgrade to 11.0.0-M12, 10.1.14, 9.0.81, or 8.5.94 or later, which fix the issue.

Written 3 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
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.059, the 93rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 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.