CVE-2026-94094OpenClaw Canvas Host Route server.ts createCanvasHostHandler denial of service
Updated under an hour ago ()
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It affects n/a OpenClaw. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.3 MEDIUM (v3.1, CNA)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
- Weakness (CWE)
- CWE-404
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulDB
- NVD analysis
- Deferred
- Record last updated
- Sep 22, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
n/a OpenClaw openclaw:openclaw | 2026.9.0; 2026.9.1; 2026.9.2; 2026.9.3; 2026.9.4; 2026.9.5 | CNA record |
References
- https://vuldb.com/vuln/408023vdb-entry, technical-description
- https://vuldb.com/vuln/408023/ctisignature, permissions-required
- https://vuldb.com/cve/CVE-2026-94094third-party-advisory
- https://vuldb.com/submit/882009third-party-advisory
- https://github.com/lche511/cve/tree/main/OpenClaw_Canvas_Big_GET_DoS_Reportexploit
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.