CVE-2026-104041

Name	CVE-2026-104041
Description	A flaw was found in SSSD. An unprivileged local user can repeatedly request lookups for nonexistent entries through the Name Service Switch (NSS) responder. Because the negative cache does not limit the total number of stored entries and only removes expired records when an existing key is rechecked, the cache can grow without bound. This behavior can lead to memory exhaustion, resulting in a Denial of Service (DoS) as the responder becomes unresponsive or terminates.
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	1150238

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
sssd (PTS)	bookworm	2.8.2-4+deb12u1	vulnerable
	trixie	2.10.1-2	vulnerable
	forky	2.13.1-4	vulnerable
	sid	2.13.1-5	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
sssd	source	(unstable)	2.13.1-5			1150238

Notes

[trixie] - sssd <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2478864
Fixed by [1/2]: https://github.com/SSSD/sssd/commit/55b35d47caf9526e911f049f7644f848fb5661ac (2.14.0-beta2)
Fixed by [2/2]: https://github.com/SSSD/sssd/commit/5b54a9cb3118ec648d29ada8a8701a1db9ad2805 (2.14.0-beta2)