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 · last modified .
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
EPSS: 0.003 (28.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-m78m-7h3q-q938) (vendor-advisory)
- VulnCheck Advisory: OpenClaw before 2026.8.2 Denial of Service via Browser Relay (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.