CVE-2025-57807 – ImageMagick BlobStream Forward-Seek Under-Allocation

CVE ID : CVE-2025-57807

Published : Sept. 5, 2025, 10:15 p.m. | 1 hour, 1 minute ago

Description : ImageMagick is free and open-source software used for editing and manipulating digital images. ImageMagick versions lower than 14.8.2 include insecure functions: SeekBlob(), which permits advancing the stream offset beyond the current end without increasing capacity, and WriteBlob(), which then expands by quantum + length (amortized) instead of offset + length, and copies to data + offset. When offset ≫ extent, the copy targets memory beyond the allocation, producing a deterministic heap write on 64-bit builds. No 2⁶⁴ arithmetic wrap, external delegates, or policy settings are required. This is fixed in version 14.8.2.

Severity: 3.8 | LOW

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