Bug 2505100 (CVE-2026-47251)

Summary:	CVE-2026-47251 libheif: libheif: Denial of Service and information disclosure via crafted HEIF file
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
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 flaw was found in libheif, a HEIF and AVIF file format decoder and encoder. An integer overflow vulnerability exists in a security check, which can be bypassed by a remote attacker providing a specially crafted HEIF file containing a VVC track. This can lead to an out-of-bounds heap read, potentially causing a denial of service or information disclosure.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2506067, 2506068
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Description OSIDB Bzimport 2026-07-21 22:17:49 UTC

libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit `b97c8b5`, PR #1712) introduced an integer overflow in the very security check it added. The check itself can be bypassed, allowing a crafted HEIF file with a VVC track to trigger the same out-of-bounds heap read that CVE-2026-3949 was meant to prevent. This is a separate, currently-unpatched vulnerability. Issue #1712 was closed as fixed without testing the edge case where `size` is near `UINT32_MAX`. Version 1.22.0 patches the issue.