Bug 2521919

Summary: CVE-2026-62292 libheif: libheif: Denial of service via crafted HEIF image processing [fedora-all]
Product: [Fedora] Fedora Reporter: Vladimir Vasilev <vvasilev>
Component: libheifAssignee: Michel Lind <michel>
Status: MODIFIED --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: dominik, multimedia-sig, ngompa13
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["abcf2e86-0d1a-43db-8143-a76bbf872d13"]}
Fixed In Version: libheif-1.23.1-9.fc45,libheif-1.23.1-9.fc46 Doc Type: ---
Doc Text:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2519179    

Description Vladimir Vasilev 2026-08-24 14:03:30 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 1.23.1, a crafted uncompressed HEIF image using generic zlib unci full-item compression can crash an application that decodes an advertised tile with heif_image_handle_decode_image_tile(). In libheif/codecs/uncompressed/unc_decoder.cc, unc_decoder::fetch_tile_data() computes a large tile offset and unc_decoder::get_compressed_image_data_uncompressed() validates it with range_start_offset plus range_size. For the last advertised tile (4095, 4095), the addition can wrap to zero, bypass the bounds check, and pass an invalid source pointer and a one-terabyte length to memcpy. The observed result is an out-of-bounds read and process crash; opening the file alone does not trigger the issue because tile decoding is required. This issue is fixed in version 1.23.1.
Comment 1 Dominik 'Rathann' Mierzejewski 2026-09-02 12:51:58 UTC 
This is fixed in 1.23.1: https://github.com/strukturag/libheif/releases/tag/v1.23.1 .