CVE-2026-109964

ImageMagick before 7.1.2-33 and 6.9.13-58 contains a heap buffer underwrite vulnerability in DecodeImage() in coders/pict.c on 32-bit builds due to pointer arithmetic overflow. Attackers can supply a crafted PICT file with maximized row, column and bytes-per-line values to bypass bounds checks and write up to 128 controlled bytes below the heap buffer, causing crashes or code execution.

Score

CVSS 4.0 6.3 Medium

Status

Awaiting Analysis - disclosure@vulncheck.com

Published

2026-10-13

Last modified

2026-10-13

Weaknesses

CWE-124

Affected products

• Imagemagick (Imagemagick)

References

• https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-mqmp-r5jh-jx7w
• https://github.com/ImageMagick/ImageMagick/commit/63dde0cf281383ab69432b88305f7dcd6a8ce900
• https://github.com/ImageMagick/ImageMagick6/commit/c18c5d5fb7f1d87ddbe0a02e9d1207c89b24588c
• https://github.com/ImageMagick/ImageMagick/blob/7.1.2-32/coders/pict.c#L503-L540
• https://github.com/ImageMagick/ImageMagick
• https://www.vulncheck.com/advisories/imagemagick-before-7.1.2-33-and-6.9.13-58-heap-buffer-underwrite-in-pict-decoder