CVE-2026-94094
OpenClaw Canvas Host Route server.ts createCanvasHostHandler denial of service
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 20, 2026
- Updated
- Sep 22, 2026
- Reserved
- Sep 20, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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 | VulDB |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R | VulDB |
| 3.0 | 4.3 Medium | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R | VulDB |
| 2.0 | 4.0 Medium | AV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR | VulDB |
Weaknesses
- CWE-404 Denial of Service
Affected Products
| Product | Versions |
|---|---|
OpenClawn/a |
|
References
- VDB-408023 | OpenClaw Canvas Host Route server.ts createCanvasHostHandler denial of servicevdb-entrytechnical-description
- VDB-408023 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
- CVE-2026-94094 | CVE Analysis and Reportthird-party-advisory
- Submit #882009 | OpenClaw openclaw@2026.6.11 Denial of Servicethird-party-advisory
- https://github.com/lche511/cve/tree/main/OpenClaw_Canvas_Big_GET_DoS_Reportexploit
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