CVE-2026-35640

low-risk
Published 2026-04-09

OpenClaw before 2026.3.25 parses JSON request bodies before validating webhook signatures, allowing unauthenticated attackers to force resource-intensive parsing operations. Remote attackers can send malicious webhook requests to trigger denial of service by exhausting server resources through forced JSON parsing before signature rejection.

Do I need to act?

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0.12% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Openclaw

References (3)

Patch https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb6...
Vendor Advisory https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
Third Party Advisory https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthentica...
26
/ 100
low-risk
Severity 21/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal