Vulnerability in Openclaw
CVE-2026-35665
OpenClaw before 2026.3.24 contains an incomplete fix for CVE-2026-32011 where the Feishu webhook handler accepts request bodies with permissive limits of 1MB and 30-second timeout before signature verification. An unauthenticated attacker can exhaust server connection resources by sending concurrent slow HTTP POST requests to the Feishu webhook endpoint, blocking legitimate webhook deliveries.
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: 0.005 (37.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.1% 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: 0.005 · change: +0.001
Affected products
- Openclaw — versions 0, 2026.3.24
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-w6m8-cqvj-pg5v (Exploit, vendor-advisory, Vendor Advisory, third-party-advisory)
- www.vulncheck.com/advisories/openclaw-denial-of-service-via-feishu-webhook-pre-… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-35665?
- CVE-2026-35665 is a medium-severity vulnerability in Openclaw, classified under Asymmetric Resource Consumption (Amplification). CVSS score: 5.3/10. Published 2026-04-10.
- How severe is CVE-2026-35665?
- Medium severity. CVSS v3 base score is 5.3 out of 10.