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

CVE ID : CVE-2025-68431

Published : Dec. 29, 2025, 7:15 p.m. | 1 hour, 7 minutes ago

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.

Severity: 6.5 | MEDIUM

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