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Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck

CVE-2026-116723FLTK through 1.4.5 Stack Buffer Overflow via Fl_BMP_Image colors_used Field

High 7.8

In plain English

A high-severity stack buffer overflow in fltk from fltk. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 94.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12fltk1.3no fix listedDEBIAN-CVE-2026-116723
Debian:13fltk1.3no fix listedDEBIAN-CVE-2026-116723
Debian:14fltk1.3no fix listedDEBIAN-CVE-2026-116723
Debian:13fltk1.4no fix listedDEBIAN-CVE-2026-116723
Debian:14fltk1.4no fix listedDEBIAN-CVE-2026-116723
Ubuntu:22.04:LTSfltk1.3no fix listedUBUNTU-CVE-2026-116723
Ubuntu:24.04:LTSfltk1.3no fix listedUBUNTU-CVE-2026-116723
Ubuntu:26.04:LTSfltk1.3no fix listedUBUNTU-CVE-2026-116723
Ubuntu:26.10fltk1.3no fix listedUBUNTU-CVE-2026-116723
Ubuntu:26.04:LTSfltk1.4no fix listedUBUNTU-CVE-2026-116723
Ubuntu:26.10fltk1.4no fix listedUBUNTU-CVE-2026-116723

Affected products (as reported)

VendorProductVersions
fltk fltk 0 – through 1.4.5

Weakness: CWE-121 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References