Vulnerability in Openclaw
CVE-2026-94094
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (40.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Openclaw — versions 2026.9.0, 2026.9.1, 2026.9.2
Weakness classification (CWE)
References
- github.com/lche511/cve/tree/main/OpenClaw_Canvas_Big_GET_DoS_Report (exploit)
- vuldb.com/cve/CVE-2026-94094 (third-party-advisory)
- vuldb.com/submit/882009 (third-party-advisory)
- vuldb.com/vuln/408023 (technical-description, vdb-entry)
- vuldb.com/vuln/408023/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-94094?
- CVE-2026-94094 is a medium-severity vulnerability in Openclaw, classified under Improper Resource Shutdown or Release. CVSS score: 4.3/10. Published 2026-09-20.
- How severe is CVE-2026-94094?
- Medium severity. CVSS v3 base score is 4.3 out of 10.