CVE-2026-41071: Struktur Libheif out-of-bounds read (CVSS 8.1)

Description

libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and prior, a crafted HEIF sequence file where the saiz box declares more samples than actually exist in the track's chunk table causes a heap-buffer-overflow (out-of-bounds read) in the SampleAuxInfoReader constructor. The SampleAuxInfoReader constructor iterates over saiz->get_num_samples() samples but doesn't validate that this count is consistent with the number of chunks in the chunks vector. When saiz declares more samples than the chunks cover, the loop increments current_chunk past chunks.size(), causing an out-of-bounds read on the chunks vector. The vulnerability is triggered during file parsing (heif_context_read_from_file) without any additional user interaction. Any application using libheif to open untrusted HEIF files is affected. This issue has been fixed in version 1.22.0.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionRequired

ScopeUnchanged

ConfidentialityHigh

IntegrityNone

AvailabilityHigh

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

Affected products

Struktur Libheif< 1.22.0

Remediation

Fixed in

Struktur Libheif≥ 1.22.0

Patch & vendor advisories

https://github.com/strukturag/libheif/security/advisories/GHSA-xj92-xjff-h8w3

References

https://github.com/strukturag/libheif/releases/tag/v1.22.0ProductRelease Notes
https://github.com/strukturag/libheif/security/advisories/GHSA-xj92-xjff-h8w3ExploitMitigationVendor Advisory

Related CVEs

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Frequently asked

Is CVE-2026-41071 being actively exploited?

CVE-2026-41071 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.44%.

How severe is CVE-2026-41071?

CVE-2026-41071 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.44% probability of exploitation.

Which products are affected by CVE-2026-41071?

Affected products include Struktur Libheif.

How do I fix CVE-2026-41071?

Upgrade affected software to a fixed version, for example Struktur Libheif 1.22.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-41071 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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