Bug 2521928

Summary:	CVE-2026-50142 libheif: libheif: Denial of Service via unbounded heap allocation in HEIF sequence parser [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Vladimir Vasilev <vvasilev>
Component:	libheif	Assignee:	Michel Lind <michel>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	epel10	CC:	dominik, multimedia-sig, ngompa13
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["0e0be1f8-bb4a-4d0b-85fe-903ed51ef0d6"]}
Fixed In Version:	libheif-1.23.5-4.el10_4 libheif-1.23.5-4.el10_3	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-10-03 00:51:59 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2519058

Description Vladimir Vasilev 2026-08-24 14:04:30 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.0, a crafted HEIF sequence accepted by heif_context_read_from_memory() with the msf1 sequence brand can cause unbounded heap allocation. In libheif/sequences/seq_boxes.cc, Box_stsz::parse() applies max_sequence_frames only to variable-size samples, so fixed-size mode accepts an attacker-controlled sample_count without a bound. In libheif/sequences/track.cc, Track::load() also adds current_sample_idx and samples_per_chunk in 32-bit arithmetic, allowing the consistency check to be bypassed by wraparound. The resulting values reach the Chunk::Chunk() allocation path, which can consume gigabytes of memory and crash or stall the process through memory exhaustion. This issue is fixed in version 1.23.0.

Comment 1 Fedora Update System 2026-09-23 00:02:38 UTC

FEDORA-EPEL-2026-0d891ec3ad (aom-3.13.3-1.el10_3 and libheif-1.23.5-3.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-0d891ec3ad

Comment 2 Fedora Update System 2026-09-23 01:18:38 UTC

FEDORA-EPEL-2026-0d891ec3ad has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-0d891ec3ad

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 3 Fedora Update System 2026-09-23 01:28:57 UTC

FEDORA-EPEL-2026-18d39b7b8d has been pushed to the Fedora EPEL 10.4 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-18d39b7b8d

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Admin user for bugzilla script actions 2026-09-23 21:40:59 UTC

This package has changed maintainer in Fedora. Reassigning to the new maintainer of this component.

Comment 5 Fedora Update System 2026-09-25 00:29:05 UTC

FEDORA-EPEL-2026-18d39b7b8d has been pushed to the Fedora EPEL 10.4 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-18d39b7b8d

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-25 00:39:15 UTC

FEDORA-EPEL-2026-0d891ec3ad has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-0d891ec3ad

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-10-03 00:51:59 UTC

FEDORA-EPEL-2026-18d39b7b8d (aom-3.13.3-1.el10_4 and libheif-1.23.5-4.el10_4) has been pushed to the Fedora EPEL 10.4 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-10-03 01:07:17 UTC

FEDORA-EPEL-2026-0d891ec3ad (aom-3.13.3-1.el10_3 and libheif-1.23.5-4.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.