CVE-2026-3713

Name	CVE-2026-3713
Description	A flaw has been found in pnggroup libpng up to 1.6.55. Affected by this vulnerability is the function do_pnm2png of the file contrib/pngminus/pnm2png.c of the component pnm2png. This manipulation of the argument width/height causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
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
libpng1.6 (PTS)	bullseye	1.6.37-3	vulnerable
	bullseye (security)	1.6.37-3+deb11u2	vulnerable
	bookworm	1.6.39-2+deb12u1	vulnerable
	bookworm (security)	1.6.39-2+deb12u3	vulnerable
	trixie	1.6.48-1+deb13u1	vulnerable
	trixie (security)	1.6.48-1+deb13u3	vulnerable
	forky, sid	1.6.55-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libpng1.6	source	(unstable)	(unfixed)	unimportant

https://github.com/pnggroup/libpng/issues/794
contrib/pngminus/pnm2png.c not built in binary packages