What is CVE-2026-100527?

CVE-2026-100527 is a medium-severity vulnerability in Openclaw, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-09-26.

How severe is CVE-2026-100527?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Openclaw

CVE-2026-100527

OpenClaw before 2026.8.2 contains a denial of service vulnerability in the Browser extension relay that allows unauthenticated network sources to exhaust pending-authentication capacity. Attackers can hold every pending slot by maintaining silent WebSocket upgrades, preventing paired extensions from completing Browser Relay Authentication v2.

Vulnerability class: DoS (Denial of Service)

Published 2026-09-26.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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-m78m-7h3q-q938 (vendor-advisory)
www.vulncheck.com/advisories/openclaw-before-2026.8.2-denial-of-service-via-bro… (third-party-advisory)

Frequently asked questions

What is CVE-2026-100527?: CVE-2026-100527 is a medium-severity vulnerability in Openclaw, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-09-26.
How severe is CVE-2026-100527?: Medium severity. CVSS v3 base score is 5.3 out of 10.