# CVE-2026-62289

## Summary

- **CVE ID:** CVE-2026-62289
- **Severity:** MEDIUM
- **CVSS Score:** 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)
- **CWE:** CWE-191, CWE-617
- **Published:** Aug 18, 2026
- **Last Modified:** Sep 14, 2026

## Description

libheif 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.

## Affected Products

- strukturag — libheif (< 1.23.1)

## References

- [CNA](https://github.com/strukturag/libheif/security/advisories/GHSA-jc8f-p23p-5hjg)
- [CNA](https://github.com/strukturag/libheif/commit/f01870c1d7323a3003796d58eba7fff502be994c)
- [CNA](https://github.com/strukturag/libheif/releases/tag/v1.23.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 23.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._