FLTK up to 1.4.5 BMP Fl_BMP_Image::load_bmp_ integer overflow

Summaryinfo

A vulnerability, which was classified as problematic, was found in FLTK up to 1.4.5. This affects the function Fl_BMP_Image::load_bmp_ of the component BMP Handler. The manipulation results in integer overflow. This vulnerability was named CVE-2026-116724. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in FLTK up to 1.4.5. Affected is the function Fl_BMP_Image::load_bmp_ of the component BMP Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

FLTK through 1.4.5 contains an integer overflow vulnerability in Fl_BMP_Image::load_bmp_() that causes undersized pixel buffer allocation from file-supplied width and height. Attackers can supply a crafted BMP or ICO file with large dimensions so row decoding writes file-derived data past the heap buffer, corrupting the application heap.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-116724 since 10/26/2026. The exploitability is told to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/26/2026).

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

Name

• FLTK

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5

Website

• Product: https://github.com/fltk/fltk/

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