What’s Vulnerable › Vulnerabilities

CVE-2026-41069: libheif allows Out-of-bounds vector access leading to invalid dereference (DoS)

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-22 · updated 2026-07-23
• Weakness: CWE-125

Description

libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, a malformed HEIF sequence file can trigger an out-of-bounds read in core sequence parsing logic, causing DoS. A malformed file can have stco.entry_count == 0 (creating no chunks) while still passing validation because saio.entry_count == 0 matches, but with saiz.sample_count > 0 the SampleAuxInfoReader constructor still enters its loop. This leads to an out-of-bounds dereference on the empty chunks[0] in chunked mode.

Affected products

• strukturag libheif: before 1.22.0 — fixed in 1.22.0

How to fix

Upgrade to a fixed version: strukturag libheif 1.22.0. Check the vendor advisory for mitigations.

References

• https://github.com/strukturag/libheif/releases/tag/v1.22.0
• https://github.com/strukturag/libheif/security/advisories/GHSA-p82x-fpmv-576r
• https://github.com/strukturag/libheif/security/advisories/GHSA-p82x-fpmv-576r

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