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CVE

CWE

Training

CVE-2025-68431

Published: Dec 29, 2025

Modified: Dec 30, 2025

PUBLISHED

CVSS v3.1

6.5

MEDIUM

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.

Vendor	Product	Versions
strukturag	libheif	affected `< 1.21.0`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

References

https://github.com/strukturag/libheif/security/advisories/GHSA-j87x-4gmq-cqfq

x_refsource_CONFIRM

https://github.com/strukturag/libheif/commit/b8c12a7b70f46c9516711a988483bed377b78d46

x_refsource_MISC

https://github.com/strukturag/libheif/releases/tag/v1.21.0

x_refsource_MISC

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