PT-2026-49256 · Julia · Libheif Jll

Published 2026-06-05 · Updated 2026-06-05

OSV

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, a malformed HEIF sequence file can trigger an out-of-bounds read in core sequence parsing logic, causing DoS. A malformed file can have stco.entry count == 0 (creating no chunks) while still passing validation because saio.entry count == 0 matches, but with saiz.sample count > 0 the SampleAuxInfoReader constructor still enters its loop. This leads to an out-of-bounds dereference on the empty chunks[0] in chunked mode.

Fix

Related Identifiers

JLSEC-2026-573

Affected Products

Libheif Jll

References · 3

• https://osv.dev/vulnerability/JLSEC-2026-573 · Vendor Advisory
• https://github.com/strukturag/libheif/security/advisories/GHSA-p82x-fpmv-576r · Note
• https://github.com/strukturag/libheif/releases/tag/v1.22.0 · Note