CVE-2026-94094
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
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 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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| n/a | OpenClaw | 2026.9.0 | affected |
| n/a | OpenClaw | 2026.9.1 | affected |
| n/a | OpenClaw | 2026.9.2 | affected |
| n/a | OpenClaw | 2026.9.3 | affected |
| n/a | OpenClaw | 2026.9.4 | affected |
| n/a | OpenClaw | 2026.9.5 | affected |
Weaknesses
- CWE-404: Denial of Service
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
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