What’s Vulnerable › Vulnerabilities

CVE-2026-94094: OpenClaw Canvas Host Route server.ts createCanvasHostHandler denial of service

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-20 · updated 2026-09-22
• Weakness: CWE-404

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.

Affected products

• OpenClaw: 2026.9.0, 2026.9.1, 2026.9.2, 2026.9.3, 2026.9.4, 2026.9.5

References

• https://github.com/lche511/cve/tree/main/OpenClaw_Canvas_Big_GET_DoS_Report
• https://vuldb.com/cve/CVE-2026-94094
• https://vuldb.com/submit/882009
• https://vuldb.com/vuln/408023
• https://vuldb.com/vuln/408023/cti

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