CVE-2026-41069: libheif Out-of-bounds Read

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.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0030

Probability of exploitation

0.21%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
struktur	libheif	< 1.22.0

References

Advisories & Patches

https://github.com/strukturag/libheif/security/advisories/GHSA-p82x-fpmv-576r https://github.com/strukturag/libheif/security/advisories/GHSA-p82x-fpmv-576r

Exploits

https://github.com/strukturag/libheif/security/advisories/GHSA-p82x-fpmv-576r https://github.com/strukturag/libheif/security/advisories/GHSA-p82x-fpmv-576r

Other References

https://github.com/strukturag/libheif/releases/tag/v1.22.0

Frequently Asked Questions

What is CVE-2026-41069? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-41069? +

CVE-2026-41069 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0030, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41069? +

CVE-2026-41069 affects products from struktur, specifically: libheif. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41069? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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