CVE-2026-18739

Name	CVE-2026-18739
Description	A flaw was found in popt, a command-line option parsing library. An off-by-one error in the poptStuffArgs function, when repeatedly called by a host application or through deep alias nesting, can lead to corruption of internal program data. This corruption could potentially enable a local attacker to execute arbitrary code if the host application then unsafely processes the altered data.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
popt (PTS)	bullseye	1.18-2	vulnerable
	bookworm	1.19+dfsg-1	vulnerable
	forky, sid, trixie	1.19+dfsg-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
popt	source	(unstable)	(unfixed)

[trixie] - popt <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2510737