| Component | OpenClaw |
| Severity | high (CVSS 7.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2026-03-05 |
| Last modified | 2026-06-17 |
| Affected versions | openclaw < 2026.2.13 |
| Fixed in | 2026.2.13 |
| Weakness | CWE-770 |
| CISA KEV | not listed |
NVD description
OpenClaw versions prior to 2026.2.13 contain a denial of service vulnerability in webhook handlers that buffer request bodies without strict byte or time limits. Remote unauthenticated attackers can send oversized JSON payloads or slow uploads to webhook endpoints causing memory pressure and availability degradation.
What to do
- Upgrade OpenClaw to
2026.2.13or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-28478
- https://github.com/openclaw/openclaw/security/advisories/GHSA-q447-rj3r-2cgh
- https://github.com/openclaw/openclaw/commit/3cbcba10cf30c2ffb898f0d8c7dfb929f15f8930
- https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unbounded-webhook-request-body-buffering
Read more
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