Allocation of Resources Without Limits or Throttling in OpenClaw - CVE-2026-41399
Published: April 30, 2026
Vulnerability identifier: #VU128640
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-41399
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenClaw
Affected software:
OpenClaw
OpenClaw
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the gateway WebSocket upgrade handling in src/gateway/server-http.ts and src/gateway/server/preauth-connection-budget.ts when processing concurrent unauthenticated WebSocket upgrade requests. A remote attacker can send many WebSocket upgrade requests to cause a denial of service.
The issue occurs before connections are allocated to an authenticated session budget.
How to mitigate CVE-2026-41399
Install security update from vendor's website.