What’s Vulnerable › Vulnerabilities

CVE-2025-68431: libheif has Potential Heap Buffer Over-Read

• 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: 2025-12-29 · updated 2026-10-07
• Weakness: CWE-125

Description

libheif is an HEIF and AVIF file format decoder and encoder. Prior to version 1.21.0, a crafted HEIF that exercises the overlay image item path triggers a heap buffer over-read in `HeifPixelImage::overlay()`. The function computes a negative row length (likely from an unclipped overlay rectangle or invalid offsets), which then underflows when converted to `size_t` and is passed to `memcpy`, causing a very large read past the end of the source plane and a crash. Version 1.21.0 contains a patch. As a workaround, avoid decoding images using `iovl` overlay boxes.

Affected products

• strukturag libheif: before 1.21.0 — fixed in 1.21.0

How to fix

Upgrade to a fixed version: strukturag libheif 1.21.0. Check the vendor advisory for mitigations.

References

• https://github.com/strukturag/libheif/commit/b8c12a7b70f46c9516711a988483bed377b78d46
• https://github.com/strukturag/libheif/releases/tag/v1.21.0
• https://github.com/strukturag/libheif/security/advisories/GHSA-j87x-4gmq-cqfq

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