AI agent vulnerability · OpenClaw

CVE-2026-41399: OpenClaw: Gateway WebSocket Denial of Service via unbounded pre-auth upgrades

mediumCVSS 4.0 5.3GHSA-f44p-c7w9-7xr7

Summary The gateway accepted unbounded concurrent unauthenticated WebSocket upgrades before allocating them to an authenticated session budget. Impact An unauthenticated network attacker could consume socket and worker capacity and disrupt WebSocket availability for legitimate clients.

Published Mar 31, 2026 · Updated Apr 28, 2026

Affected packages

openclaw

Ecosystem: npm
Affected: <= 2026.3.24
Fixed in: 2026.3.28
Check: npm ls openclaw

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Summary

The gateway accepted unbounded concurrent unauthenticated WebSocket upgrades before allocating them to an authenticated session budget.

Impact

An unauthenticated network attacker could consume socket and worker capacity and disrupt WebSocket availability for legitimate clients.

Affected Component

src/gateway/server-http.ts, src/gateway/server/preauth-connection-budget.ts

Fixed Versions

Affected: <= 2026.3.24
Patched: >= 2026.3.28
Latest stable 2026.3.28 contains the fix.

Fix

Fixed by commit cb5f7e201f (gateway: cap concurrent pre-auth websocket upgrades).

Discovered by：Topsec AlphaLab (wang dong)

Credited to topsec-bunney.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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