CVE-2026-47178

libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.19.0 through 1.21.2, a crafted HEIF file (uncompressed `unci` codec, tiled, component-interleaved, 4:2:0) triggers a heap out-of-bounds write in libheif's uncompressed tile decoder. The write overwrites the C++ vtable pointer of an adjacent `unc_decoder_component_interleave` object; the next virtual call dispatches to an attacker-chosen address. Version 1.22.0 patches the issue.

Score

CVSS 3.1 7.8 High

Status

Analyzed - security-advisories@github.com

Published

2026-07-21

Last modified

2026-10-24

Weaknesses

CWE-787

Affected products

• Libheif (Struktur)
• Libheif (Strukturag)

References

• https://github.com/strukturag/libheif/security/advisories/GHSA-5x55-x5pf-9c6g