CVE-2026-48029: libheif: heap OOB read in ImageItem_Grid::decode_grid_tile via irot-induced tile-coordinate underflow

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-07-22 · updated 2026-10-24
Weakness: CWE-125

Description

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.19.0 through 1.21.2 have a heap OOB read in ImageItem_Grid::decode_grid_tile via irot-induced tile-coordinate underflow. Version 1.22.0 fixes the issue.

Affected products

strukturag libheif: from 1.19.0 before 1.22.0 — fixed in 1.22.0

How to fix

Upgrade to a fixed version: strukturag libheif 1.22.0. Check the vendor advisory for mitigations.

References

https://github.com/strukturag/libheif/commit/e523ec0bf379110b7c33d4c159f8b1202d332157
https://github.com/strukturag/libheif/security/advisories/GHSA-6x5f-qchq-cxqv
https://github.com/strukturag/libheif/security/advisories/GHSA-6x5f-qchq-cxqv

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