EUVD-2026-21476

| CVE-2026-35665 MEDIUM
2026-04-10 VulnCheck
6.9
CVSS 4.0
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CVSS Vector

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch Released
Apr 10, 2026 - 20:30 nvd
Patch available
EUVD ID Assigned
Apr 10, 2026 - 16:30 euvd
EUVD-2026-21476
Analysis Generated
Apr 10, 2026 - 16:30 vuln.today
CVE Published
Apr 10, 2026 - 16:03 nvd
MEDIUM 6.9

Tags

Information Disclosure

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.

Analysis

OpenClaw before version 2026.3.24 allows unauthenticated remote denial of service via the Feishu webhook handler, which accepts request bodies up to 1MB with a 30-second timeout before verifying the request signature. An attacker can exhaust server connection resources by sending concurrent slow HTTP POST requests, blocking legitimate webhook deliveries and degrading service availability. …

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Priority Score

34
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +34
POC: 0

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EUVD-2026-21476 vulnerability details – vuln.today
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