CVE-2026-100527: OpenClaw before 2026.8.2 Denial of Service via Browser Relay

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-26 · updated 2026-10-05
Weakness: CWE-400

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

OpenClaw: before 2026.8.2 — fixed in 2026.8.2

How to fix

Upgrade to a fixed version: OpenClaw 2026.8.2. Check the vendor advisory for mitigations.

References

https://github.com/openclaw/openclaw/security/advisories/GHSA-m78m-7h3q-q938
https://www.vulncheck.com/advisories/openclaw-before-2026.8.2-denial-of-service-via-browser-relay

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