Vulnerability Description
OpenClaw before 2026.3.25 parses JSON request bodies before validating webhook signatures, allowing unauthenticated attackers to force resource-intensive parsing operations. Remote attackers can send malicious webhook requests to trigger denial of service by exhausting server resources through forced JSON parsing before signature rejection.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openclaw | Openclaw | < 2026.3.25 |
Related Weaknesses (CWE)
References
- https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb6Patch
- https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456Vendor Advisory
- https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticaThird Party Advisory
FAQ
What is CVE-2026-35640?
CVE-2026-35640 is a vulnerability with a CVSS score of 5.3 (MEDIUM). OpenClaw before 2026.3.25 parses JSON request bodies before validating webhook signatures, allowing unauthenticated attackers to force resource-intensive parsing operations. Remote attackers can send ...
How severe is CVE-2026-35640?
CVE-2026-35640 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-35640?
Check the references section above for vendor advisories and patch information. Affected products include: Openclaw Openclaw.