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2.1
CVE-2026-94094: OpenClaw Canvas Host can be stopped by crafted request
CVE-2026-94094 · published 29 days ago
Summary
OpenClaw versions up to 2026.9.5 let a specially crafted request to the Canvas Host route consume all memory, causing the service to stop responding. The problem can be triggered from anywhere on the network and the published exploit makes it easy to use. Until a proper fix is released, limit access to the Canvas Host endpoint and monitor for unusually large file requests.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| – | openclaw | 2026.9.0 |
Original advisory text
OpenClaw Canvas Host Route server.ts createCanvasHostHandler denial of service
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.
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Type
CWE-404Improper Resource Shutdown or Release
Timeline
Published20 Sep 2026
Updated19 Oct 2026
First seen20 Sep 2026
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