CVE-2026-32740
highpriority · track · 10EPSS 0.007 · 52 %ileexploit · PoCEURUUSEPSS · scored 2026-10-27
libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled data past the end of a chroma plane heap allocation by crafting a HEIF/AVIF file with a 1×4 grid of odd-height tiles. The overflow is triggered during normal image decoding with default build configuration. The written bytes are chroma (Cb/Cr) pixel values from the attacking tile, giving the attacker full control over the overflow content. This issue has been fixed in version 1.22.0.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
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exploits (1)
Public proof-of-concept and weaponised exploit code.
affected products (6)
Products and version ranges known to be affected.
also known as (3)
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sources
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references (10)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2026-32740cnnvd
- https://github.com/strukturag/libheif/releasesPatchcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2026-32740cnnvd
- https://github.com/strukturag/libheif/releases/tag/v1.22.0enisa_euvd
- https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6jenisa_euvd
- https://access.redhat.com/security/cve/CVE-2026-32740nvd
- https://bugzilla.redhat.com/show_bug.cgi?id=2479969nvd
- https://github.com/strukturag/libheif/releases/tag/v1.22.0Release Notesnvd
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