Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Struktur | Libheif | < 1.21.0 |
Related Weaknesses (CWE)
References
- https://github.com/strukturag/libheif/commit/b8c12a7b70f46c9516711a988483bed377bPatch
- https://github.com/strukturag/libheif/releases/tag/v1.21.0ProductRelease Notes
- https://github.com/strukturag/libheif/security/advisories/GHSA-j87x-4gmq-cqfqExploitPatchVendor Advisory
FAQ
What is CVE-2025-68431?
CVE-2025-68431 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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::ove...
How severe is CVE-2025-68431?
CVE-2025-68431 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-68431?
Check the references section above for vendor advisories and patch information. Affected products include: Struktur Libheif.