CVE-2026-104039

Name	CVE-2026-104039
Description	A flaw was found in SSSD. A local user can cause a denial of service (DoS) by disrupting system authentication services. When handling Generic Security Services Application Programming Interface (GSSAPI) authentication in the Pluggable Authentication Module (PAM) responder, cached connection state is freed upon completion without clearing the reference pointer. An attacker can exploit this by sending an additional request over the same connection, causing the service to access invalid memory and unexpectedly terminate.
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=2478956
Fixed by: https://github.com/SSSD/sssd/commit/f3e65b06ccbe083dd569a6ccf8e6ad6405862852 (2.14.0-beta2)