ImageMagick has heap-buffer-overflow via signed integer overflow in WriteUHDRImage when writing UHDR images with large dimensions
`WriteUHDRImage` in `coders/uhdr.c` uses `int` arithmetic to compute the pixel buffer size. When image dimensions are large, the multiplication overflows 32-bit `int`, causing an undersized heap allocation followed by an out-of-bounds write. This can crash the process or potentially lead to an out of bounds heap write. ``` ==1575126==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fc382ef3820 at pc 0x5560d31f229f bp 0x7ffe865f9530 sp 0x7ffe865f9520 WRITE of size 8 at 0x7fc382ef3820 thread T0 #0 0x5560d31f229e in WriteUHDRImage coders/uhdr.c:807 ```
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-25794US | — | — | ||
ImageMagick is free and open-source software used for editing and manipulating digital images. `WriteUHDRImage` in `coders/uhdr.c` uses `int` arithmetic to compute the pixel buffer… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/ImageMagick/ImageMagickPACKAGE
- https://github.com/ImageMagick/ImageMagick/commit/ffe589df5ff8ce1433daa4ccb0d2a9fadfbe30edWEB
- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-vhqj-f5cj-9x8hWEB
- https://github.com/dlemstra/Magick.NET/releases/tag/14.10.3WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-25794ADVISORY
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