{"id":"CVE-2026-116723","title":"FLTK through 1.4.5 Stack Buffer Overflow via Fl_BMP_Image colors_used Field","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-121"],"vendor":"fltk","product":"fltk","affected":["fltk <= 1.4.5"],"published":"2026-10-26","updated":"2026-10-26","sourceUpdated":"2026-10-26T21:52:27.469Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-116723","references":[{"url":"https://github.com/fltk/fltk/issues/1632","label":"GitHub Issue #1632"},{"url":"https://github.com/fltk/fltk"},{"url":"https://github.com/fltk/fltk/commit/3a049d8262dc759cf9737339420e8457e24c0cb1"},{"url":"https://github.com/fltk/fltk/blob/release-1.4.5/src/Fl_BMP_Image.cxx#L255-L265"},{"url":"https://hackmd.io/@haindpwn/fltk-bmp-image-stack-heap-overflow"},{"url":"https://www.vulncheck.com/advisories/fltk-through-1.4.5-stack-buffer-overflow-via-fl-bmp-image-colors-used-field","label":"VulnCheck Advisory: FLTK through 1.4.5 Stack Buffer Overflow via Fl_BMP_Image colors_used Field"}],"tags":["cve.org"],"epss":0.0016,"epssPercentile":0.05062,"ingestedAt":"2026-10-27T16:11:59.119Z","slug":"CVE-2026-116723","body":"## Overview\n\nFLTK 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.\n\n## Affected\n\n- `fltk <= 1.4.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}