All vulnerabilities
CVE-2026-100558GHSA-4r25-35qc-fr6j

OpenClaw before 2026.8.1 Resource Exhaustion via WebSocket Upgrade

OpenClaw OpenClaw
Open in ThreatlineRecord JSON
CVSS
8.7High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.28%Chance of exploitation activity in the next 30 days, higher than 19% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in2026.8.1Fixed versionCVE List
Published26 Sep 2026Updated 28 Sep 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 2

  • OpenClawaffected: all versions before 2026.8.1CVE List
  • OpenClawunaffected: 2026.8.1CVE List

References 2