| Component | OpenClaw |
| Severity | medium (CVSS 5.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Published (NVD) | 2026-04-09 |
| Last modified | 2026-06-17 |
| Affected versions | openclaw < 2026.3.25 |
| Fixed in | 2026.3.25 |
| Weakness | CWE-696 |
| CISA KEV | not listed |
NVD description
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.
What to do
- Upgrade OpenClaw to
2026.3.25or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-35640
- https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456
- https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53
- https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing
Read more
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