Improper Resource Shutdown or Release in OpenClaw - CVE-2026-100558
Published: November 3, 2026
Vulnerability identifier: #VU158808
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-100558
CWE-ID: CWE-404
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service by exhausting Gateway listener resources.
The vulnerability exists due to improper resource shutdown or release in the OpenClaw Gateway's ordinary HTTP handler when processing requests carrying a WebSocket upgrade header without matching connection semantics. A remote attacker can repeatedly send these requests to retain response sockets and associated request state without consuming the WebSocket pre-auth connection budget, exhausting listener resources because the handler returns without ending the responses.
Affected software
OpenClaw
How to mitigate CVE-2026-100558
Install security update from vendor's website.
OpenClaw - update to 2026.8.1