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 · last modified .
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
EPSS: 0.003 (28.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-xw48-j584-r73h) (vendor-advisory)
- VulnCheck Advisory: OpenClaw before 2026.8.1 SMS Webhook Rate Limit Bypass (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.