CVE-2026-32738 - libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk

CVE-2026-32738 - libheif has a Heap OOB Read/SEGV Crash via Zero samples_per_chunk

https://cvefeed.io/rssfeed/latest.atom / Tue, 05/19/2026 - 23:24
CVE ID :CVE-2026-32738
Published : May 19, 2026, 7:16 p.m. | 1 hour, 41 minutes ago
Description :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.
Severity: 6.5 | MEDIUM
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