CVE-2026-47247

Name	CVE-2026-47247
Description	libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs in libheif chain to leak process heap memory as visible pixel values in decoded grid images. An attacker who uploads a crafted AVIF/HEIC file to any server-side image processor (WordPress, Sharp/libvips, ImageMagick, etc.) can recover heap data - including library function pointers sufficient to defeat ASLR, or any other secret - from the publicly-downloadable transcoded JPEG/PNG/WebP output. Local attack vectors are also possible. Version 1.22.0 fixes the issue.
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-6417-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libheif (PTS)	bullseye	1.11.0-1	vulnerable
	bullseye (security)	1.11.0-1+deb11u2	vulnerable
	bookworm, bookworm (security)	1.15.1-1+deb12u1	vulnerable
	trixie	1.19.8-1	vulnerable
	trixie (security)	1.19.8-1+deb13u1	fixed
	forky	1.21.2-4	vulnerable
	sid	1.23.1-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libheif	source	trixie	1.19.8-1+deb13u1		DSA-6417-1
libheif	source	(unstable)	1.23.1-1

https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3