What’s Vulnerable › Vulnerabilities

CVE-2026-116724: FLTK through 1.4.5 Heap Buffer Overflow via Fl_BMP_Image Integer Overflow

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-26 · updated 2026-10-31
• Weakness: CWE-190

Description

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.

Affected products

• fltk: through 1.4.5

References

• https://github.com/fltk/fltk
• https://github.com/fltk/fltk/blob/release-1.4.5/src/Fl_BMP_Image.cxx#L281-L286
• https://github.com/fltk/fltk/commit/3a049d8262dc759cf9737339420e8457e24c0cb1
• https://github.com/fltk/fltk/issues/1632
• https://hackmd.io/@haindpwn/fltk-bmp-image-stack-heap-overflow
• https://www.vulncheck.com/advisories/fltk-through-1.4.5-heap-buffer-overflow-via-fl-bmp-image-integer-overflow

Get alerted when CVE-2026-116724 or the next vulnerability affects your stack