EUVD-2026-21136
GHSA-8f9r-gr6r-x63q
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4Blast Radius
ecosystem impact- 3 npm packages depend on openclaw (3 direct, 0 indirect)
Ecosystem-wide dependent count for version 2026.3.28.
DescriptionNVD
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.
AnalysisAI
OpenClaw before version 2026.3.25 processes JSON webhook request bodies before validating cryptographic signatures, allowing unauthenticated remote attackers to trigger denial of service by submitting malicious webhook payloads that force computationally expensive JSON parsing operations. The vulnerability exploits a logic-ordering defect where signature validation occurs after resource-intensive parsing, enabling attackers to exhaust server resources without valid credentials. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Share
External POC / Exploit Code
Leaving vuln.today