---
title: "CVE-2026-94018: Web add-on HTTP Server - Denial of Service"
description: "Web add-on HTTP server contains a null pointer dereference caused by Content-Length underflow in PUT request processing, letting unauthenticated remote attackers cause denial of service, exploit requires a single malformed request."
url: https://panop.io/threat-heartbeat/CVE-2026-94018/
---

# CVE-2026-94018 Web add-on HTTP Server - Denial of Service

Web add-on HTTP server contains a null pointer dereference caused by Content-Length underflow in PUT request processing, letting unauthenticated remote attackers cause denial of service, exploit requires a single malformed request.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-94018)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

20 October 2026

Updated

21 October 2026

Weakness

[CWE-457](https://cwe.mitre.org/data/definitions/457.html)

## Vendor fix

Update to the latest version.

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-2026-94018](https://nvd.nist.gov/vuln/detail/CVE-2026-94018)
- [https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-wjxf-gjm5-jh5q](https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-wjxf-gjm5-jh5q)

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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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