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.
Metrics
Affected Vendors & Products
References
History
Wed, 25 Feb 2026 15:00:00 +0000
| Type | Values Removed | Values Added |
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| CPEs | cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:* |
Mon, 05 Jan 2026 10:45:00 +0000
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| First Time appeared |
Struktur
Struktur libheif |
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| Vendors & Products |
Struktur
Struktur libheif |
Tue, 30 Dec 2025 23:15:00 +0000
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| Metrics |
ssvc
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Mon, 29 Dec 2025 19:15:00 +0000
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| 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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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-12-30T22:26:20.374Z
Reserved: 2025-12-17T15:29:39.380Z
Link: CVE-2025-68431
Updated: 2025-12-30T21:54:36.793Z
Status : Analyzed
Published: 2025-12-29T19:15:56.933
Modified: 2026-02-25T14:53:34.747
Link: CVE-2025-68431
No data.
OpenCVE Enrichment
Updated: 2026-01-05T10:23:13Z