CVE-2026-42146CWE-789

CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp

Medium · published May 4, 2026

CVSS v3.1
5.5
EPSS
0%
Percentile
6.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00172 · 6.3th percentile
Weakness
CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-05-04T17:53Z
EPSS history
Timeline
  • 04 MAY 17:53Z
    CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp
    cvelistv5