Description
OpenClaw versions before 2026.8.1 contain a resource exhaustion vulnerability in the Gateway listener that allows unauthenticated clients to retain response sockets by sending WebSocket upgrade requests without matching connection semantics. Attackers can repeatedly send malformed upgrade requests to exhaust listener resources and cause denial of service without consuming the WebSocket pre-auth connection budget.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenClaw | OpenClaw | < 2026.8.1 | 2026.8.1 |
Advisories 1
- WID-SEC-2026-3316 OpenClaw: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 27, 2026
References
- GitHub Security Advisory (GHSA-4r25-35qc-fr6j) vendor-advisory
- VulnCheck Advisory: OpenClaw before 2026.8.1 Resource Exhaustion via WebSocket Upgrade third-party-advisory