CVE-2026-86243

Name	CVE-2026-86243
Description	Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix 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/9a7c804afc05fdc630520eb4012ce1c4ff787862 (2.0.16)
Fixed by: https://github.com/apache/tomcat-native/commit/ce019af0db385dfd5bc7c7a759f71602559a0499 (1.3.9)
https://lists.apache.org/thread/8p4jf02w54m22x0cwpq2x53w3ov8o557