Bug 2538797 (CVE-2026-84384)

Summary: CVE-2026-84384 libheif: libheif: Denial of Service due to unbounded memory consumption via crafted HEIF/AVIF files
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libheif, a HEIF and AVIF file format decoder and encoder. A remote attacker could exploit this vulnerability by providing a crafted HEIF or AVIF file containing malicious metadata or image data. This could cause the application to consume an unbounded amount of memory during decompression, leading to a denial of service (DoS) due to process termination.
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Bug Depends On: 2539256, 2539257    
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Description OSIDB Bzimport 2026-09-22 20:41:27 UTC 
libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.2, crafted HEIF or AVIF mime metadata and unci image data can cause decompress_brotli() and do_inflate() to grow accumulated output without an effective size limit or MemoryHandle accounting. The brotli path has no output bound, while the zlib path checks only a small temporary buffer in a branch that valid streams do not reach, and overlapping icef units can decompress the same payload repeatedly. HeifContext::interpret_heif_file_images() processes multiple compressed metadata items during file opening, allowing a small file to consume unbounded memory and terminate the process. This issue is fixed in version 1.23.2.