---
title: "CVE-2026-116724: FLTK - Integer Overflow"
description: "FLTK through 1.4.5 contains an integer overflow caused by undersized pixel buffer allocation in Fl_BMP_Image::load_bmp_(), letting attackers supply crafted BMP or ICO files to corrupt the application heap, exploit requires crafted file input."
url: https://panop.io/threat-heartbeat/CVE-2026-116724/
---

# CVE-2026-116724 FLTK - Integer Overflow

FLTK through 1.4.5 contains an integer overflow caused by undersized pixel buffer allocation in Fl\_BMP\_Image::load\_bmp\_(), letting attackers supply crafted BMP or ICO files to corrupt the application heap, exploit requires crafted file input.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-116724)

## Details

Type

Integer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

26 October 2026

Updated

27 October 2026

Weakness

[CWE-190](https://cwe.mitre.org/data/definitions/190.html)

## Vendor fix

Update to the latest version beyond 1.4.5.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-116724](https://nvd.nist.gov/vuln/detail/CVE-2026-116724)
- [https://hackmd.io/@haindpwn/fltk-bmp-image-stack-heap-overflow](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](https://www.vulncheck.com/advisories/fltk-through-1.4.5-heap-buffer-overflow-via-fl-bmp-image-integer-overflow)
- [https://github.com/fltk/fltk](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/blob/release-1.4.5/src/Fl_BMP_Image.cxx#L281-L286)
- [https://github.com/fltk/fltk/commit/3a049d8262dc759cf9737339420e8457e24c0cb1](https://github.com/fltk/fltk/commit/3a049d8262dc759cf9737339420e8457e24c0cb1)
- [https://github.com/fltk/fltk/issues/1632](https://github.com/fltk/fltk/issues/1632)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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