CVE-2026-94094

MEDIUM 4.3

OpenClaw Canvas Host Route server.ts createCanvasHostHandler denial of service

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-404
Vendor	n/a
Product	openclaw
Published	Sep 20, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

n/a / OpenClaw

2026.9.0 2026.9.1 2026.9.2 2026.9.3 2026.9.4 2026.9.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 pengguogood (VulDB User) VulDB CNA Team