Bug 2480853 (CVE-2026-41071)

Summary: CVE-2026-41071 libheif: libheif: Information disclosure or denial of service via crafted HEIF file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in libheif, a library for decoding and encoding HEIF (High Efficiency Image File Format) and AVIF files. A remote attacker could exploit this vulnerability by providing a specially crafted HEIF sequence file. When parsing the file, if the saiz (sample auxiliary information) box declares more samples than are actually present, it can lead to a heap-buffer-overflow due to an out-of-bounds read. This issue can result in information disclosure or a denial of service.
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Description OSIDB Bzimport 2026-05-22 22:01:19 UTC 
libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, a crafted HEIF sequence file where the saiz box declares more samples than actually exist in the track's chunk table causes a heap-buffer-overflow (out-of-bounds read) in the SampleAuxInfoReader constructor. The SampleAuxInfoReader constructor iterates over saiz->get_num_samples() samples but doesn't validate that this count is consistent with the number of chunks in the chunks vector. When saiz declares more samples than the chunks cover, the loop increments current_chunk past chunks.size(), causing an out-of-bounds read on the chunks vector. The vulnerability is triggered during file parsing (heif_context_read_from_file) without any additional user interaction. Any application using libheif to open untrusted HEIF files is affected. This issue has been fixed in version 1.22.0.