Bug 2425902 (CVE-2025-68431)

Summary:	CVE-2025-68431 libheif: libheif has Potential Heap Buffer Over-Read
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A heap buffer over-read flaw was found in the libheif HEIF/AVIF image decoder and encoder used in multimedia applications. When processing a crafted HEIF image containing overlay image items, the function HeifPixelImage::overlay() may compute a negative row length, which underflows when converted to an unsigned size_t. This underflow value is passed to memcpy(), resulting in a read past the end of the source image buffer. If a user opens or decodes such a crafted image, this can trigger an application crash and denial of service.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2426446, 2426447, 2426449, 2426448
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Description OSIDB Bzimport 2025-12-29 20:01:53 UTC

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.