medium4.3
CVE-2026-94094
A flaw has been found in OpenClaw up to 2026.9.5.
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| OpenClaw | before 2026.9.5. |
Versions were read from the advisory text. No structured product data has been published for this record yet.