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.
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Fixes
Solution
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References
History
Mon, 29 Dec 2025 19:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | libheif has Potential Heap Buffer Over-Read | |
| Weaknesses | CWE-125 CWE-190 |
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cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-12-29T19:09:54.628Z
Reserved: 2025-12-17T15:29:39.380Z
Link: CVE-2025-68431
Vulnrichment
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NVD
Status : Received
Published: 2025-12-29T19:15:56.933
Modified: 2025-12-29T19:15:56.933
Link: CVE-2025-68431
Redhat
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OpenCVE Enrichment
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