CVE-2026-87876

Name	CVE-2026-87876
Description	Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations.
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	1147521

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
cups (PTS)	bookworm, bookworm (security)	2.4.2-3+deb12u9	vulnerable
	trixie	2.4.10-3+deb13u2	vulnerable
	trixie (security)	2.4.10-3+deb13u1	vulnerable
	forky	2.4.18-1	vulnerable
	sid	2.4.20-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
cups	source	(unstable)	2.4.20-1			1147521

Notes

https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2
Fixed by: https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8 (v2.4.20)