OpenClaw versions prior to 2026.2.14 contain a denial of service vulnerability in the fetchWithGuard function that allocates entire response payloads in memory before enforcing maxBytes limits. Remote attackers can trigger memory exhaustion by serving oversized responses without content-length headers to cause availability loss.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://github.com/openclaw/openclaw/commit/00a08908892d1743d1fc52e5cbd9499dd5d…
disclosure@vulncheck.com
https://github.com/openclaw/openclaw/security/advisories/GHSA-j27p-hq53-9wgc
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unbounded-u…
disclosure@vulncheck.com