Vulnerability · Published Sep 26, 2026 · Assigned by VulnCheck
CVE-2026-100527OpenClaw before 2026.8.2 Denial of Service via Browser Relay
Medium 5.3
In plain English
A medium-severity uncontrolled resource consumption in OpenClaw from OpenClaw. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.3%top 71.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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