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CVE-2026-47178 — libheif has Heap Out Of Bounds Write in unci subsystem

Affected: strukturag libheif

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.

USN-8479-1 — libheif vulnerabilities

Affected: Ubuntu:25.10: libheif, Ubuntu:26.04:LTS: libheif

It was discovered that libheif incorrectly handled certain crafted HEIF files. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-47178)

It was discovered that libheif incorrectly validated offsets when decoding certain crafted HEIF files. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-49271)