Bug 2539271

Summary: CVE-2026-84451 libheif: libheif: Denial of Service due to out-of-bounds read in image tile processing [fedora-43]
Product: [Fedora] Fedora Reporter: Vladimir Vasilev <vvasilev>
Component: libheifAssignee: Michel Lind <michel>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 43CC: dominik, multimedia-sig, ngompa13
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["0b176165-3a06-42a0-a575-2e84e544a8d0"]}
Fixed In Version: libheif-1.23.5-3.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-26 01:31:20 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: 2443911, 2538885    

Description Vladimir Vasilev 2026-09-23 09:10:01 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 1.23.3, the no-icef full-item branch of unc_decoder::get_compressed_image_data_uncompressed() in libheif/codecs/uncompressed/unc_decoder.cc retains an addition-based range check that can wrap when a crafted uncompressed tile grid produces a large range_start_offset and range_size. The overflow makes the bounds comparison pass and allows heif_image_handle_decode_image_tile() to call memcpy() with an invalid source pointer and a very large length when decoding a valid high-index advertised tile. This incomplete remediation of CVE-2026-62292 can reliably crash tile-processing applications, while whole-image decoding is not claimed to reach the demonstrated path. This issue is fixed in version 1.23.3.
Comment 1 Michel Lind 2026-09-24 11:00:48 UTC 
This bug is already fixed in a published Bodhi update.
Comment 2 Fedora Update System 2026-09-24 11:01:27 UTC 
FEDORA-2026-022ff83e3e (libheif-1.23.5-3.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-022ff83e3e
Comment 3 Fedora Update System 2026-09-26 01:31:20 UTC 
FEDORA-2026-022ff83e3e (libheif-1.23.5-3.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.