High severity · published Sep 26, 2026
CVE-2026-100558
OpenClaw before 2026.8.1 Resource Exhaustion via WebSocket Upgrade
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
OpenClaw versions before 2026.8.1 contain a resource exhaustion vulnerability in the Gateway listener that allows unauthenticated clients to retain response sockets by sending WebSocket upgrade requests without matching connection semantics. Attackers can repeatedly send malformed upgrade requests to exhaust listener resources and cause denial of service without consuming the WebSocket pre-auth connection budget.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenClaw · OpenClaw
before 2026.8.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100558
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100558
vendor-advisory
https://github.com/openclaw/openclaw/security/advisories/GHSA-4r25-35qc-fr6j
third-party-advisory
https://www.vulncheck.com/advisories/openclaw-before-2026.8.1-resource-exhaustion-via-websocket-upgrade
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