CVE-2026-86247

Name	CVE-2026-86247
Description	Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected. Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
tomcat-native (PTS)	bookworm	1.2.35-1	vulnerable
	trixie	1.3.1-1	vulnerable
	forky, sid	2.0.16-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
tomcat-native	source	(unstable)	2.0.16-1

Notes

[trixie] - tomcat-native <no-dsa> (Minor issue)
[bookworm] - tomcat-native <postponed> (Minor issue)
Fixed by: https://github.com/apache/tomcat-native/commit/fb688de41e837d98e76961e44584b37989e4f7d0 (2.0.16)
Fixed by: https://github.com/apache/tomcat-native/commit/3dc73c118d2202c8dfc6053787cc6d61416ddce6 (1.3.9)
https://lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1