What is CVE-2026-35640?

CVE-2026-35640 is a medium-severity vulnerability in Openclaw, classified under CWE-696. CVSS score: 5.3/10. Published 2026-04-09.

How severe is CVE-2026-35640?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Openclaw

CVE-2026-35640

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 d…

EPSS: 0.001 (31.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Openclaw — versions 0, 2026.3.25

Weakness classification (CWE)

CWE-696

References

GitHub Security Advisory (GHSA-3h52-cx59-c456) (third-party-advisory)
Patch Commit (patch)
VulnCheck Advisory: OpenClaw < 2026.3.25 - Denial of Service via Unauthenticated Webhook Request Parsing (third-party-advisory)

Frequently asked questions

What is CVE-2026-35640?: CVE-2026-35640 is a medium-severity vulnerability in Openclaw, classified under CWE-696. CVSS score: 5.3/10. Published 2026-04-09.
How severe is CVE-2026-35640?: Medium severity. CVSS v3 base score is 5.3 out of 10.