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CVE-2026-34238 affects ImageMagick versions prior to 7.1.2-19 and 6.9.13-44. The flaw is in the despeckle operation, specifically the DespeckleImage function in MagickCore/effect.c. The function computes the size of a padded pixel buffer using (image->columns + 2) * (image->rows + 2). On 32-bit builds, this calculation is stored in a 32-bit size_t and can overflow when processing attacker-controlled images with very large dimensions. For dimensions near 65,534 by 65,534, the multiplication wraps from 4,294,967,296 to a near-zero value, causing AcquireVirtualMemory to allocate an undersized heap buffer. The despeckle routine then continues processing based on the full image dimensions and writes past the end of the allocated heap region, resulting in a heap-based out-of-bounds write.
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