CVE-2025-68431

Publication date 29 December 2025

Last updated 12 January 2026

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libheif	25.10 questing	Fixed 1.20.2-1ubuntu0.1
	25.04 plucky	Fixed 1.19.7-1ubuntu0.1
	24.04 LTS noble	Fixed 1.17.6-1ubuntu4.2
	22.04 LTS jammy	Fixed 1.12.0-2ubuntu0.1~esm2
	20.04 LTS focal	Fixed 1.6.1-1ubuntu0.1~esm2
	18.04 LTS bionic	Fixed 1.1.0-2ubuntu0.1~esm2

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Notes

mdeslaur

only a denial of service

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libheif	Upstream: b8c12a7

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-7952-1
libheif vulnerabilities
12 January 2026