Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| n/a / OpenClaw | affected 2026.9.0; affected 2026.9.1; affected 2026.9.2; affected 2026.9.3; affected 2026.9.4; affected 2026.9.5 |
CWE
CWE-404
References
- https://vuldb.com/vuln/408023
- https://vuldb.com/vuln/408023/cti
- https://vuldb.com/cve/CVE-2026-94094
- https://vuldb.com/submit/882009
- https://github.com/lche511/cve/tree/main/OpenClaw_Canvas_Big_GET_DoS_Report
ADP enrichment
No English description supplied.
No references supplied.