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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb…
disclosure@vulncheck.com
https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthentic…
disclosure@vulncheck.com