CVE-2026-42146 MEDIUM

CVE-2026-42146: CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp

Vendor Greyclab
Product CImg
Weakness CWE-789
Published May 4, 2026
Last update May 6, 2026

CVSS base score

5.5/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 4, 2026 CVE published
May 6, 2026 Record updated