---
id: CVE-2026-94094
title: A flaw has been found in OpenClaw up to 2026.9.5
summary: >-
  A flaw has been found in OpenClaw up to 2026.9.5. Affected is the function
  createCanvasHostHandler of the file extensions/canvas/src/host/server.ts of
  the component Canvas Host Route. Executing a manipulation can lead to denial
  of servic…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-404
product: OpenClaw
affected:
  - OpenClaw 2026.9.0
  - OpenClaw 2026.9.1
  - OpenClaw 2026.9.2
  - OpenClaw 2026.9.3
  - OpenClaw 2026.9.4
  - OpenClaw 2026.9.5
published: '2026-09-20'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T16:18:17.050'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94094'
references:
  - url: >-
      https://github.com/lche511/cve/tree/main/OpenClaw_Canvas_Big_GET_DoS_Report
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-94094'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/882009'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/408023'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/408023/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00471
epssPercentile: 0.38111
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T15:30:11.647018Z'
ingestedAt: '2026-09-20T23:28:09.528Z'
---

## Overview

A flaw has been found in OpenClaw up to 2026.9.5. Affected is the function createCanvasHostHandler of the file extensions/canvas/src/host/server.ts of the component Canvas Host Route. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been published and may be used. Fix suggestion's "streaming/size-limit" was never shipped - latest 2026.9.5 still buffers the whole file via readFile() (src/canvas/serve.runtime.ts:17,114), unlike the sibling WS path which caps at 64KB. The vendor was contacted early about this disclosure.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.