OpenClaw before 2026.3.28 accepts unbounded concurrent unauthenticated WebSocket upgrades without pre-authentication budget allocation.
Date: 2026-04
Affected: openclaw/openclaw
Attack vector: dos
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-41399
CWE: CWE-770
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

OpenClaw before 2026.3.28 accepts unbounded concurrent unauthenticated WebSocket upgrades without pre-authentication budget allocation. Unauthenticated network attackers can exhaust socket and worker capacity to disrupt WebSocket availability for legitimate clients.


Mitigations:

Architectural layers (MAESTRO):