CVE-2026-96512

Name	CVE-2026-96512
Description	A flaw was found in sudo. When sudoers rules use NOTBEFORE or NOTAFTER time-based access restrictions with timestamps that omit the trailing 'Z' timezone indicator, the time evaluation relies on the TZ environment variable inherited from the calling user. Because sudo is a setuid-root program, an unprivileged local user can set TZ to an extreme timezone offset to shift the authorization window by up to approximately 25 hours, causing expired rules to be treated as valid. This allows the user to execute commands outside the intended time window. Authentication is not bypassed; only the time-based authorization check is affected.
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	1148890

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
sudo (PTS)	bookworm	1.9.13p3-1+deb12u4	vulnerable
	bookworm (security)	1.9.13p3-1+deb12u2	vulnerable
	trixie	1.9.16p2-3+deb13u2	vulnerable
	forky	1.9.17p2-8	vulnerable
	sid	1.9.17p2-9	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
sudo	source	(unstable)	1.9.17p2-9			1148890

Notes

[trixie] - sudo <no-dsa> (Minor issue)
https://www.openwall.com/lists/oss-security/2026/09/24/4
https://bugzilla.redhat.com/show_bug.cgi?id=2539327
Fixed by: https://github.com/sudo-project/sudo/commit/db669167ca599f2a94cd8a4c5fae9e473c81a2fd
Fixed by: https://github.com/sudo-project/sudo/commit/1820a349687522f51023d1ae5925125f59679a8c