CVE-2026-32738

6.5 MEDIUM

libheif is a HEIF and AVIF file format decoder and encoder

Published: 2026-05-19 · Last updated: 2026-05-20

Severity and scoring

CVSS: 6.5 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE: CWE-125, CWE-476

Affected products

Vendor	Product
struktur	libheif

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-32738
[Vendor advisory]https://github.com/strukturag/libheif/security/advisories/GHSA-7f2h-cmpf-v9ww
[Vendor advisory]https://github.com/strukturag/libheif/security/advisories/GHSA-7f2h-cmpf-v9ww

Related CVEs

Same vendor

CVE-2026-41071 — libheif is a HEIF and AVIF file format decoder and encoder (8.1 HIGH)
CVE-2026-41069 — libheif is a HEIF and AVIF file format decoder and encoder (6.5 MEDIUM)
CVE-2026-32740 — libheif is a HEIF and AVIF file format decoder and encoder (8.8 HIGH)
CVE-2026-32739 — libheif is a HEIF and AVIF file format decoder and encoder (6.5 MEDIUM)

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