CVE-2026-100527CWE-400denial-of-service

CVE-2026-100527

Medium · published September 26, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
27.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00349 · 27.3th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-09-26T07:16Z
References (2)
https://github.com/openclaw/openclaw/security/advisories/GHSA-m78m-7h3q-q938 · [email protected]https://www.vulncheck.com/advisories/openclaw-before-2026.8.2-denial-of-service-via-browser-relay · [email protected]
EPSS history
Timeline
  • 27 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 26 SEP 02:18Z
    OpenClaw before 2026.8.2 Denial of Service via Browser Relay
    cvelistv5