Bug 2538826 (CVE-2026-84446)

Summary:	CVE-2026-84446 libheif: libheif: Denial of Service via crafted HEIF sequence timing data
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
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. A remote attacker could provide a crafted HEIF file containing malicious sequence timing and edit-list data. This could lead to non-terminating decode loops and unbounded memory allocation, resulting in severe CPU and memory exhaustion, effectively causing a Denial of Service (DoS) on the system processing the file.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2539260, 2539261
Bug Blocks:

Description OSIDB Bzimport 2026-09-22 20:48:14 UTC

libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, crafted HEIF sequence timing and edit-list data can make Track::init_sample_timing_table() compute a logical m_num_output_samples value that exceeds the uint32_t counters used by Track_Visual::decode_next_image_sample() and Track::get_next_sample_raw_data(). The resulting comparison can never reach the oversized output count, causing non-terminating decode or raw-sample loops and bypassing max_sequence_frames. The same sequence path repeatedly calls Box_stts::get_sample_duration() and allocates Chunk::m_sample_ranges and Track::m_presentation_timeline outside MemoryHandle accounting, allowing severe CPU and memory exhaustion from a small file. This issue is fixed in version 1.23.2.