CVE-2026-100558: Openclaw

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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

• Openclaw Openclaw: before 2026.8.1 (fixed in 2026.8.1)

Published 2026-09-26. Last modified 2026-09-28.