What’s Vulnerable › Vulnerabilities

CVE-2026-35665: OpenClaw < 2026.3.24 - Denial of Service via Feishu Webhook Pre-Auth Body Parsing

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-10 · updated 2026-06-17
• Weakness: CWE-405

Description

OpenClaw before 2026.3.24 contains an incomplete fix for CVE-2026-32011 where the Feishu webhook handler accepts request bodies with permissive limits of 1MB and 30-second timeout before signature verification. An unauthenticated attacker can exhaust server connection resources by sending concurrent slow HTTP POST requests to the Feishu webhook endpoint, blocking legitimate webhook deliveries.

Affected products

• OpenClaw: before 2026.3.24 — fixed in 2026.3.24

How to fix

Upgrade to a fixed version: OpenClaw 2026.3.24. Check the vendor advisory for mitigations.

References

• https://github.com/openclaw/openclaw/security/advisories/GHSA-w6m8-cqvj-pg5v
• https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-feishu-webhook-pre-auth-body-parsing

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