Resource exhaustion in Openclaw
CVE-2026-100571
OpenClaw (npm package 'openclaw') versions >= 2026.6.6 and < 2026.8.1 apply the SMS webhook invalid-request rate limit before Twilio signature verification and identify clients only by the raw proxy socket address. In deployments where the SMS/Twilio webhook sits behind a trusted reverse proxy or tunnel so that multiple external clients share one socket address, an unauthenticated remote sender can exhaust the shared pre-authentication rate-limit budget with invalid requests, causing subsequent correctly signed Twilio callbacks to receive HTTP 429 responses. The result is temporary inbound SMS loss while the shared window remains exhausted; the attacker cannot forge a callback or access message data. Fixed in 2026.8.1.
Vulnerability class: DoS (Denial of Service)
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-xw48-j584-r73h (vendor-advisory)
- www.vulncheck.com/advisories/openclaw-before-2026.8.1-sms-webhook-rate-limit-by… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100571?
- CVE-2026-100571 is a medium-severity vulnerability in Openclaw, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-09-26.
- How severe is CVE-2026-100571?
- Medium severity. CVSS v3 base score is 5.3 out of 10.