CVE-2026-116723
FLTK through 1.4.5 Stack Buffer Overflow via Fl_BMP_Image colors_used Field
- State
- Published
- Severity
- 8.5 High
- Published
- Oct 26, 2026
- Updated
- Oct 26, 2026
- Reserved
- Oct 26, 2026
Description
FLTK through 1.4.5 contains a stack-based buffer overflow vulnerability in Fl_BMP_Image::load_bmp_() that allows attackers to corrupt stack memory by supplying an oversized BMP colors_used field. Attackers can craft BMP or ICO files with colors_used above 256 to overflow the 768-byte colormap array, causing crashes or potential code execution.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.5 High | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.8 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-121 Stack-based Buffer Overflow
Affected Products
| Product | Versions |
|---|---|
fltkfltk |
|
References
- GitHub Issue #1632issue-tracking
- https://github.com/fltk/fltkproduct
- https://github.com/fltk/fltk/commit/3a049d8262dc759cf9737339420e8457e24c0cb1patch
- https://github.com/fltk/fltk/blob/release-1.4.5/src/Fl_BMP_Image.cxx#L255-L265technical-description
- https://hackmd.io/@haindpwn/fltk-bmp-image-stack-heap-overflowthird-party-advisory
- VulnCheck Advisory: FLTK through 1.4.5 Stack Buffer Overflow via Fl_BMP_Image colors_used Fieldthird-party-advisory
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