CVE-2026-100558

HIGHCVSS 7.5

Description

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.

Timeline

Published:September 26th, 2026 3:17 AM

Last modified:September 28th, 2026 6:17 PM

CVSS Scoring

CVSS v3: 7.5 (HIGH)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-400

References & Reports

Advisories, patches, and third-party reports

https://github.com/openclaw/openclaw/security/advisories/GHSA-4r25-35qc-fr6j
https://www.vulncheck.com/advisories/openclaw-before-2026.8.1-resource-exhaustion-via-websocket-upgrade

Source: NIST NVD · Data may lag official sources by up to one minute