libheif: Integer underflow in Fraction constructor via double clap transform application

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-62289
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-18 22:17:02 UTC
Updated2026-08-19 17:19:54 UTC
Descriptionlibheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted HEIF or AVIF file containing a clean aperture box can reduce an image dimension to zero and crash or corrupt tiling results when heif_image_handle_get_image_tiling(handle, 1, &tiling) is called. ImageItem::get_heif_image_tiling() returns already transformed dimensions, and process_image_transformations_on_tiling() applies the clean aperture transformation again. The second application passes zero to Box_clap::left_rounded(0), where image_width minus one underflows and constructs Fraction(0xFFFFFFFF, 2). Debug builds reach an assertion and abort, while release builds can return a corrupt crop and zero-width tiling result. The affected implementation spans libheif/image-items/image_item.cc, libheif/context.cc, and libheif/box.cc. This issue is fixed in version 1.23.1.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

EPSS: 0.003940000 probability, percentile 0.328160000 (date 2026-08-19)

Problem Types: CWE-191 | CWE-617 | CWE-191 CWE-191: Integer Underflow (Wrap or Wraparound) | CWE-617 CWE-617: Reachable Assertion

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Strukturag Libheif affected < 1.23.1 Not specified

References

ReferenceSourceLinkTags
github.com/strukturag/libheif/releases/tag/v1.23.1 [email protected] github.com
github.com/strukturag/libheif/commit/f01870c1d7323a3003796d58eba7fff502b... [email protected] github.com
github.com/strukturag/libheif/security/advisories/GHSA-jc8f-p23p-5hjg [email protected] github.com
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