OpenClaw Canvas Host Route server.ts createCanvasHostHandler denial of service
Published Sep 20, 2026 · Updated Nov 3, 2026
Original summary
Normalized public record · Updated Nov 3, 2026
OpenClaw Canvas Host Route server.ts createCanvasHostHandler denial of service
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
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.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- VDB-408023 | OpenClaw Canvas Host Route server.ts createCanvasHostHandler denial of service ↗
- VDB-408023 | CTI Indicators (IOB, IOC, TTP, IOA) ↗
- CVE-2026-94094 | CVE Analysis and Report ↗
- Submit #882009 | OpenClaw openclaw@2026.6.11 Denial of Service ↗
- Source repository ↗
Record history
Published Sep 20, 2026 · Last refreshed Nov 3, 2026