GreycLab CImg prior .3.7.5 PPM File _load_pnm dimension integer overflow

Summaryinfo

A vulnerability, which was classified as problematic, has been found in GreycLab CImg. This affects the function _load_pnm of the component PPM File Handler. This manipulation of the argument dimension causes integer overflow. This vulnerability appears as CVE-2026-42144. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in GreycLab CImg. It has been declared as problematic. Affected by this vulnerability is the function _load_pnm of the component PPM File Handler. The manipulation of the argument dimension with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect integrity, and availability. The summary by CVE is:

CImg Library is a C++ library for image processing. Prior to commit 4ca26bc, there is an integer overflow vulnerability in the W*H*D size computation inside _load_pnm() that can bypass the memory allocation guard. A crafted PNM/PGM/PPM file with large dimension values causes the overflow to wrap around, allocating an undersized buffer and potentially triggering a heap buffer overflow. Any application using CImg to load untrusted image files is affected. This issue has been patched via commit 4ca26bc.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-42144 since 04/24/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 321387 (Fedora 45 : krita (2026-4084e20f7e)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version .3.7.5 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 4ca26bce4d8c61fcd1507d5f9401b9fb1222c27d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (321387). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• GreycLab

Name

• CImg

License

• open-source

Website

• Product: https://github.com/GreycLab/CImg/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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