CVE-2026-100558CWE-400denial-of-service

CVE-2026-100558

High · published September 26, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
19.2
In the wild
Unconfirmed
What it is

OpenClaw versions before 2026.8.1 contain a resource exhaustion vulnerability in the Gateway listener that allows unauthenticated clients to retain response sockets by sending WebSocket upgrade requests without matching connection semantics. Attackers can repeatedly send malformed upgrade requests to exhaust listener resources and cause denial of service without consuming the WebSocket pre-auth connection budget.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00278 · 19.2th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-09-26T07:17Z
References (2)
https://github.com/openclaw/openclaw/security/advisories/GHSA-4r25-35qc-fr6j · [email protected]https://www.vulncheck.com/advisories/openclaw-before-2026.8.1-resource-exhaustion-via-websocket-upgrade · [email protected]
EPSS history
Timeline
  • 27 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 26 SEP 02:18Z
    OpenClaw before 2026.8.1 Resource Exhaustion via WebSocket Upgrade
    cvelistv5