🛡️ CVE-2025-68431
🟡 CVSS 6.5 — Medium ⚠️ Exploit Public CWE-125 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

libheif is an HEIF and AVIF file format decoder and encoder. Prior to version 1.21.0, a crafted HEIF that exercises the overlay image item path triggers a heap buffer over-read in `HeifPixelImage::overlay()`. The function computes a negative row length (likely from an unclipped overlay rectangle or invalid offsets), which then underflows when converted to `size_t` and is passed to `memcpy`, causing a very large read past the end of the source plane and a crash. Version 1.21.0 contains a patch. As a workaround, avoid decoding images using `iovl` overlay boxes.

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE CWE-125
Public Exploit ⚠️ Yes
Source NVD
Published 2025-12-29
Updated 2026-06-02
Modified 2026-02-25

Affected Packages

Software From version Fixed in
libheif — 1.21.0

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