CVE-2026-94094 | OpenClaw up to 2026.9.5 Canvas Host Route server.ts createCanvasHostHandler denial of service

A vulnerability was found in OpenClaw up to 2026.9.5. It has been declared as problematic. 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.

This vulnerability is tracked as CVE-2026-94094. The attack can be launched remotely. Moreover, an exploit is present.

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.VulDB Recent EntriesRead More