What is CVE-2026-100558?

CVE-2026-100558 is a high-severity vulnerability in Openclaw, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-26.

How severe is CVE-2026-100558?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Openclaw

CVE-2026-100558

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.

Vulnerability class: DoS (Denial of Service)

Published 2026-09-26.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Openclaw

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/openclaw/openclaw/security/advisories/GHSA-4r25-35qc-fr6j (vendor-advisory)
www.vulncheck.com/advisories/openclaw-before-2026.8.1-resource-exhaustion-via-w… (third-party-advisory)

Frequently asked questions

What is CVE-2026-100558?: CVE-2026-100558 is a high-severity vulnerability in Openclaw, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-26.
How severe is CVE-2026-100558?: High severity. CVSS v3 base score is 7.5 out of 10.