{"id":"UBUNTU-CVE-2026-116723","details":"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.","modified":"2026-11-04T03:30:34.660876134Z","published":"2026-11-03T00:00:00Z","upstream":["CVE-2026-116723"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-116723"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-116723"},{"type":"REPORT","url":"https://github.com/fltk/fltk/issues/1632"},{"type":"REPORT","url":"https://github.com/fltk/fltk/commit/3a049d8262dc759cf9737339420e8457e24c0cb1"},{"type":"REPORT","url":"https://github.com/fltk/fltk"},{"type":"REPORT","url":"https://github.com/fltk/fltk/blob/release-1.4.5/src/Fl_BMP_Image.cxx#L255-L265"},{"type":"REPORT","url":"https://hackmd.io/@haindpwn/fltk-bmp-image-stack-heap-overflow"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/fltk-through-1.4.5-stack-buffer-overflow-via-fl-bmp-image-colors-used-field"}],"affected":[{"package":{"name":"fltk1.3","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/fltk1.3?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.3-4","1.3.3-6","1.3.3-7"],"ecosystem_specific":{"binaries":[{"binary_name":"fltk1.3-games","binary_version":"1.3.3-7"},{"binary_name":"fluid","binary_version":"1.3.3-7"},{"binary_version":"1.3.3-7","binary_name":"libfltk-cairo1.3"},{"binary_version":"1.3.3-7","binary_name":"libfltk-forms1.3"},{"binary_version":"1.3.3-7","binary_name":"libfltk-gl1.3"},{"binary_name":"libfltk-images1.3","binary_version":"1.3.3-7"},{"binary_name":"libfltk1.3","binary_version":"1.3.3-7"},{"binary_version":"1.3.3-7","binary_name":"libfltk1.3-compat-headers"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116723.json"}},{"package":{"name":"fltk1.3","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/fltk1.3?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.4-6"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.4-6","binary_name":"fltk1.3-games"},{"binary_version":"1.3.4-6","binary_name":"fluid"},{"binary_name":"libfltk-cairo1.3","binary_version":"1.3.4-6"},{"binary_name":"libfltk-forms1.3","binary_version":"1.3.4-6"},{"binary_name":"libfltk-gl1.3","binary_version":"1.3.4-6"},{"binary_name":"libfltk-images1.3","binary_version":"1.3.4-6"},{"binary_name":"libfltk1.3","binary_version":"1.3.4-6"},{"binary_name":"libfltk1.3-compat-headers","binary_version":"1.3.4-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116723.json"}},{"package":{"name":"fltk1.3","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/fltk1.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.4-9ubuntu1","1.3.4-10","1.3.4-10build1"],"ecosystem_specific":{"binaries":[{"binary_name":"fltk1.3-games","binary_version":"1.3.4-10build1"},{"binary_version":"1.3.4-10build1","binary_name":"fluid"},{"binary_name":"libfltk-cairo1.3","binary_version":"1.3.4-10build1"},{"binary_name":"libfltk-forms1.3","binary_version":"1.3.4-10build1"},{"binary_name":"libfltk-gl1.3","binary_version":"1.3.4-10build1"},{"binary_name":"libfltk-images1.3","binary_version":"1.3.4-10build1"},{"binary_version":"1.3.4-10build1","binary_name":"libfltk1.3"},{"binary_version":"1.3.4-10build1","binary_name":"libfltk1.3-compat-headers"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116723.json"}},{"package":{"name":"fltk1.3","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/fltk1.3?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.5-3","1.3.8-2","1.3.8-3","1.3.8-4"],"ecosystem_specific":{"binaries":[{"binary_name":"fltk1.3-games","binary_version":"1.3.8-4"},{"binary_version":"1.3.8-4","binary_name":"fluid"},{"binary_version":"1.3.8-4","binary_name":"libfltk-cairo1.3"},{"binary_name":"libfltk-forms1.3","binary_version":"1.3.8-4"},{"binary_version":"1.3.8-4","binary_name":"libfltk-gl1.3"},{"binary_version":"1.3.8-4","binary_name":"libfltk-images1.3"},{"binary_name":"libfltk1.3","binary_version":"1.3.8-4"},{"binary_name":"libfltk1.3-compat-headers","binary_version":"1.3.8-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116723.json"}},{"package":{"name":"fltk1.3","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/fltk1.3?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.8-5","1.3.8-6","1.3.8-6.1build1","1.3.8-6.1build2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.8-6.1build2","binary_name":"fltk1.3-games"},{"binary_name":"fluid","binary_version":"1.3.8-6.1build2"},{"binary_name":"libfltk-cairo1.3t64","binary_version":"1.3.8-6.1build2"},{"binary_version":"1.3.8-6.1build2","binary_name":"libfltk-forms1.3t64"},{"binary_n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