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CVE-2025-68431

libheif has Potential Heap Buffer Over-Read

Published: Dec 29, 2025Updated: Feb 25, 2026 Sources: CVE List NVDCWE-125
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 81.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-125CWE-190

Affected Products

libheifstruktur
LibraryLibrary
OSS Libraries / generic-library
libheifstrukturag
Library
OSS Libraries / generic-library
struktuross-projectOSS Librariesaka libde265, libheif, libde265 libheif
strukturagoss-projectOSS Librariesaka libheif, libde265, strukturag/libde265

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Collection
Initial Access
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References

https://github.com/strukturag/libheif/commit/b8c12a7b70f46c9516711a988483bed377b78d46
github.com
https://github.com/strukturag/libheif/releases/tag/v1.21.0
github.com
https://github.com/strukturag/libheif/security/advisories/GHSA-j87x-4gmq-cqfq
github.com

Timeline

Published
Dec 29, 2025
Last Updated
Feb 25, 2026

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