CVE-2026-116723
FLTK through 1.4.5 Stack Buffer Overflow via Fl_BMP_Image colors_used Field
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-121 |
| Vendor | fltk |
| Product | fltk |
| Published | Oct 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
fltk / fltk
0 ≤ 1.4.5
References
github.com: https://github.com/fltk/fltk/issues/1632 github.com: https://github.com/fltk/fltk github.com: https://github.com/fltk/fltk/commit/3a049d8262dc759cf9737339420e8457e24c0cb1 github.com: https://github.com/fltk/fltk/blob/release-1.4.5/src/Fl_BMP_Image.cxx#L255-L265 hackmd.io: https://hackmd.io/@haindpwn/fltk-bmp-image-stack-heap-overflow vulncheck.com: https://www.vulncheck.com/advisories/fltk-through-1.4.5-stack-buffer-overflow-via-fl-bmp-image-colors-used-field
Credits
HaiND from the Post and Telecommunication Institute of Technology