What is CVE-2026-41399?

CVE-2026-41399 is a high-severity vulnerability in Openclaw, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-28.

How severe is CVE-2026-41399?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Openclaw

CVE-2026-41399

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 availabil…

EPSS: 0.001 (27.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Openclaw — versions 0, 2026.3.28

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

GitHub Security Advisory (GHSA-f44p-c7w9-7xr7) (vendor-advisory, Patch, Vendor Advisory)
VulnCheck Advisory: OpenClaw < 2026.3.28 - Denial of Service via Unbounded Pre-auth WebSocket Upgrades (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-41399?: CVE-2026-41399 is a high-severity vulnerability in Openclaw, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-28.
How severe is CVE-2026-41399?: High severity. CVSS v3 base score is 7.5 out of 10.