CVE-2026-73637

Name	CVE-2026-73637
Description	Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests when AuthDigestNcCheck is enabled or AuthDigestNonceLifetime is set to 0. Users are recommended to upgrade to version 2.4.69, which fixes this 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)
References	DSA-6569-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
apache2 (PTS)	bookworm	2.4.68-1~deb12u1	vulnerable
	bookworm (security)	2.4.67-1~deb12u3	vulnerable
	trixie	2.4.68-1~deb13u1	vulnerable
	trixie (security)	2.4.69-1~deb13u1	fixed
	forky, sid	2.4.69-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
apache2	source	trixie	2.4.69-1~deb13u1		DSA-6569-1
apache2	source	(unstable)	2.4.69-1

Notes

https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2026-73637
Fixed by: https://github.com/apache/httpd/commit/fc722c619fdf7f8eb69eb8bd4201265065cd3ac2