CVE-2026-35640: Openclaw

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Openclaw Openclaw: before 2026.3.25 (fixed in 2026.3.25)

Published 2026-04-09. Last modified 2026-06-17.