EUVD-2026-30972CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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2DescriptionNVD
libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and below, a crafted 792-byte HEIF sequence file with samples_per_chunk=0 in the stsc box causes an unsigned integer underflow in the Chunk constructor (m_last_sample = 0 + 0 - 1 = UINT32_MAX), mapping all samples to an empty chunk and resulting in a denial of service. When any sample is accessed, the library reads from index 0 of an empty std::vector, causing a guaranteed SEGV (null-page read). The file parses successfully without producing an error; the crash occurs on the first frame access. This issue has been fixed in version 1.22.0.
AnalysisAI
Denial of service in libheif versions 1.21.2 and below allows a remote attacker to crash any application linked against the library by supplying a crafted HEIF sequence file. The crash is deterministic - the malformed file passes parsing without error, then triggers a guaranteed SEGV on the first frame access due to an unsigned integer underflow that maps all media samples to an empty chunk. …
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