CVE-2025-52434

Name	CVE-2025-52434
Description	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat when using the APR/Native connector. This was particularly noticeable with client initiated closes of HTTP/2 connections. This issue affects Apache Tomcat: from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other, older, EOL versions may also be affected. Users are recommended to upgrade to version 9.0.107, which fixes the issue.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-4244-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
tomcat9 (PTS)	bullseye	9.0.43-2~deb11u10	vulnerable
	bullseye (security)	9.0.107-0+deb11u1	fixed
	bookworm	9.0.70-2	fixed
	forky, sid, trixie	9.0.95-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
tomcat9	source	bullseye	9.0.107-0+deb11u1		DLA-4244-1
tomcat9	source	(unstable)	9.0.70-2

Notes

Starting with 9.0.70-2 src:tomcat9 no longer ships the server stack, using that as the fixed version
https://github.com/apache/tomcat/commit/8a83c3c42d20762782678932c14005cd3397a018 (9.0.107)