GreycLab CImg up to 4.0.6 BMP File CImg.h _load_bmp integer overflow

Summaryinfo

A vulnerability has been found in GreycLab CImg up to 4.0.6 and classified as problematic. This vulnerability affects the function _load_bmp of the file CImg.h of the component BMP File Handler. The manipulation leads to integer overflow. This vulnerability is traded as CVE-2026-117555. An attack has to be approached locally. There is no exploit available.

Detailsinfo

A vulnerability was found in GreycLab CImg up to 4.0.6 and classified as problematic. This issue affects the function _load_bmp of the file CImg.h of the component BMP File Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

CImg through 4.0.6 contains a heap out-of-bounds read vulnerability in the _load_bmp() function of CImg.h caused by an integer overflow in the row byte count. Attackers can supply a crafted BMP file with a large header width that wraps dx_bytes, causing crashes or heap memory disclosure into the decoded image.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-117555 since 10/27/2026. The exploitation is known to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/27/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• GreycLab

Name

• CImg

Version

• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.0.6

Website

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

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