CVE-2026-29169

Name	CVE-2026-29169
Description	A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs. The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version 1.2.0. Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.
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)
Debian Bugs	1135737

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
apache2 (PTS)	bullseye	2.4.62-1~deb11u1	vulnerable
	bullseye (security)	2.4.66-1~deb11u1	vulnerable
	bookworm	2.4.66-1~deb12u1	vulnerable
	bookworm (security)	2.4.62-1~deb12u2	vulnerable
	trixie	2.4.66-1~deb13u2	vulnerable
	forky, sid	2.4.66-8	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
apache2	source	(unstable)	2.4.67-1			1135737

Notes

http://www.openwall.com/lists/oss-security/2026/05/04/20
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2026-29169
https://github.com/apache/httpd/commit/225dc070adba11040b774cf641e1d8bc79941643 (2.4.67-rc1-candidate)