Medium 5.5Published May 4, 2026

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

Updated under an hour ago (Oct 28, 2026, 3:40 AM ET)

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It affects GreycLab CImg. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for GreycLab CImg

Exploited in the last 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.

CVSS: 5.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-789
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: May 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

GreycLab CImg greyclab:cimg (from the name)	before c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3	CNA record

References

References

https://github.com/GreycLab/CImg/security/advisories/GHSA-g54r-qmgx-c6fv	x-refsource-confirm
https://github.com/GreycLab/CImg/issues/477	x-refsource-misc
https://github.com/GreycLab/CImg/commit/c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3	x-refsource-misc
https://github.com/GreycLab/CImg/releases/tag/v.3.7.5	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.