CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp

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Summary

CVECVE-2026-42146
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-04 18:16:31 UTC
Updated2026-05-07 15:50:00 UTC
DescriptionCImg 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

EPSS: 0.000130000 probability, percentile 0.019690000 (date 2026-05-12)

Problem Types: CWE-789 | CWE-789 CWE-789: Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GreycLab CImg affected < c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3 Not specified

References

ReferenceSourceLinkTags
github.com/GreycLab/CImg/releases/tag/v.3.7.5 [email protected] github.com
github.com/GreycLab/CImg/security/advisories/GHSA-g54r-qmgx-c6fv [email protected] github.com
github.com/GreycLab/CImg/issues/477 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/GreycLab/CImg/commit/c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3 [email protected] github.com
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