CVE-2026-94094

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.

References

https://vuldb.com/vuln/408023/cti

https://vuldb.com/vuln/408023

https://vuldb.com/submit/882009

https://vuldb.com/cve/CVE-2026-94094

https://github.com/lche511/cve/tree/main/OpenClaw_Canvas_Big_GET_DoS_Report

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-83801

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS