CVE-2026-47251 — libheif has an incomplete fix for CVE-2026-3949: integer overflow bypass in vvdec_push_data2

Description

libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit `b97c8b5`, PR #1712) introduced an integer overflow in the very security check it added. The check itself can be bypassed, allowing a crafted HEIF file with a VVC track to trigger the same out-of-bounds heap read that CVE-2026-3949 was meant to prevent. This is a separate, currently-unpatched vulnerability. Issue #1712 was closed as fixed without testing the edge case where `size` is near `UINT32_MAX`. Version 1.22.0 patches the issue.

Affected products

Vendor	Product	Affected	Fixed
strukturag	libheif	< 1.22.0	—

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

SUSE

Security tracker ↗

Release	Package	Fixed in	Advisory
SLES 15 SP7	libheif	1.23.0-150700.3.15.1	SUSE-SU-2026:2622-1

Show 2 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
SLES for SAP 16.0	libheif	1.23.0-160000.1.1	SUSE-SU-2026:22153-1
SLES 16.0	libheif	1.23.0-160000.1.1	SUSE-SU-2026:22153-1

openSUSE