Vulnerability details

CVE-2026-41399

OpenClaw OpenClaw

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

CVSS 4.0

8.7High

Official description

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.

CVSS scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`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`
7.5High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
OpenClaw	OpenClaw	v < 2026.3.28	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-04-28
Last updated: 2026-04-29
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.31%

Probability of exploitation in 30 days

24.9%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-770
Allocation of Resources Without Limits or Throttling