CVE-2026-47178

libheif has Heap Out Of Bounds Write in unci subsystem

State: Published
Severity: 6.1 Medium
Published: Jul 21, 2026
Updated: Jul 22, 2026
Reserved: May 18, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H	GitHub_M

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
libheifstrukturag	>= 1.19.0, < 1.22.0Affected

References

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

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