CVE-2026-35640 Details
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.
A denial-of-service vulnerability has been identified in OpenClaw versions prior to 2026.3.25. The issue arises because the application processes JSON request bodies for Feishu webhooks before validating the authenticity of the signatures. This flaw allows unauthenticated attackers to send malicious webhook requests that force the server to engage in resource-intensive JSON parsing. As a result, server resources can be exhausted, leading to a denial-of-service condition.
Users can upgrade to OpenClaw version 2026.3.25 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 10, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-696 | Incorrect Behavior Order | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| openclaw openclaw | < 2026.3.25 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 15, 2026 | Initial Analysis | [email protected] |
| Apr 9, 2026 | New CVE Received | [email protected] |