CVE-2026-116723
CVE-2026-116723 · FLTK through 1.4.5 Stack Buffer Overflow via Fl_BMP_Image colors_used Field
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.5 · High · EPSS 0.2%
- Published
- Updated
Stack: system
Affected products and versions
fltk
- Versions
- ≥ 0, ≤ 1.4.5: Affected (custom)
No fix published
fltk1.3 Debian:12
- Versions
- 1.3.11-1
- 1.3.11-2
- 1.3.11-3
- 1.3.8-5
- 1.3.8-6
- 1.3.8-6.1
- 1.3.8-6.1~exp1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
fltk1.3 Debian:13
- Versions
- 1.3.11-2
- 1.3.11-3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
fltk1.3 Debian:14
- Versions
- 1.3.11-2
- 1.3.11-3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
fltk1.4 Debian:13
- Versions
- 1.4.3-1
- 1.4.4-1
- 1.4.4-2
- 1.4.4-3
- 1.4.4-4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
fltk1.4 Debian:14
- Versions
- 1.4.3-1
- 1.4.4-1
- 1.4.4-2
- 1.4.4-3
- 1.4.4-4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://github.com/fltk/fltk/issues/1632
- https://github.com/fltk/fltk
- https://github.com/fltk/fltk/commit/3a049d8262dc759cf9737339420e8457e24c0cb1
- https://github.com/fltk/fltk/blob/release-1.4.5/src/Fl_BMP_Image.cxx#L255-L265
- https://hackmd.io/@haindpwn/fltk-bmp-image-stack-heap-overflow
- https://www.vulncheck.com/advisories/fltk-through-1.4.5-stack-buffer-overflow-via-fl-bmp-image-colors-used-field
- https://nvd.nist.gov/vuln/detail/CVE-2026-116723