CVE-2026-54240

Name	CVE-2026-54240
Description	libde265 is an open source implementation of the h.265 video codec. Versions prior to 1.1.1 use signed 32-bit arithmetic to calculate pixel offsets, allowing a crafted HEVC stream with large image dimensions to trigger an integer overflow and cause out-of-bounds heap reads or writes, potentially disclosing data, corrupting memory, or crashing the decoder. Version 1.1.1 contains a patch.
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)
References	DSA-6413-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libde265 (PTS)	bookworm	1.0.11-1+deb12u2	vulnerable
	trixie (security), trixie	1.0.15-1+deb13u2	fixed
	forky	1.1.2-1	fixed
	sid	1.1.3-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libde265	source	trixie	1.0.15-1+deb13u1		DSA-6413-1
libde265	source	(unstable)	1.1.1-1

Notes

https://github.com/strukturag/libde265/security/advisories/GHSA-ccfw-29x7-rrx3
https://github.com/strukturag/libde265/commit/bdca87569b9c63c2a7054d90ae4462dbb78d159a (v1.1.1)