CVE-2026-47178

MEDIUM

libheif has Heap Out Of Bounds Write in unci subsystem

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 6.1
EPSS 0.0020
EPSS Percentile 10.0%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-787
Status published
Products (2)
struktur/libheif 1.19.0 - 1.22.0
strukturag/libheif >= 1.19.0, < 1.22.0
Published Jul 21, 2026
Tracked Since Jul 22, 2026