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Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck

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

High 7.8

In plain English

A high-severity integer overflow in fltk from fltk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.1%top 96.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12fltk1.3no fix listedDEBIAN-CVE-2026-116724
Debian:13fltk1.3no fix listedDEBIAN-CVE-2026-116724
Debian:14fltk1.3no fix listedDEBIAN-CVE-2026-116724
Debian:13fltk1.4no fix listedDEBIAN-CVE-2026-116724
Debian:14fltk1.4no fix listedDEBIAN-CVE-2026-116724
Ubuntu:22.04:LTSfltk1.3no fix listedUBUNTU-CVE-2026-116724
Ubuntu:24.04:LTSfltk1.3no fix listedUBUNTU-CVE-2026-116724
Ubuntu:26.04:LTSfltk1.3no fix listedUBUNTU-CVE-2026-116724
Ubuntu:26.10fltk1.3no fix listedUBUNTU-CVE-2026-116724
Ubuntu:26.04:LTSfltk1.4no fix listedUBUNTU-CVE-2026-116724
Ubuntu:26.10fltk1.4no fix listedUBUNTU-CVE-2026-116724

Affected products (as reported)

VendorProductVersions
fltk fltk 0 – through 1.4.5

Weakness: CWE-190 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References