CVE-2026-41399

HIGH 7.5

OpenClaw < 2026.3.28 - Denial of Service via Unbounded Pre-auth WebSocket Upgrades

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	openclaw
Product	openclaw
Published	Apr 28, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

OpenClaw / OpenClaw

0 < 2026.3.28

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/openclaw/openclaw/security/advisories/GHSA-f44p-c7w9-7xr7 vulncheck.com: https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unbounded-pre-auth-websocket-upgrades

Credits

🔍 wang dong (@topsec-bunney)