23 Oct 2026 15:48:27 UTC
libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoS
cve-program · CVE-2026-84384 · Published
CVE-2026-84384
libheif: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoS
CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-84384
Publishedlibheif 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.
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