CVE-2026-42146: Greyclab Cimg

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

CImg Library is a C++ library for image processing. Prior to commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5.

Affected products

• Greyclab Cimg: before c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3 (fixed in c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3)

Published 2026-05-04. Last modified 2026-06-17.