# CVE-2026-35640

## Summary

- **CVE ID:** CVE-2026-35640
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N)
- **CWE:** CWE-696
- **Published:** Apr 9, 2026
- **Last Modified:** Jun 23, 2026

## 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.

## Affected Products

- OpenClaw — OpenClaw (0)
- OpenClaw — OpenClaw (2026.3.25)

## References

- [CNA](https://github.com/openclaw/openclaw/security/advisories/GHSA-3h52-cx59-c456)
- [CNA](https://github.com/openclaw/openclaw/commit/5e8cb22176e9235e224be0bc530699261eb60e53)
- [CNA](https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unauthenticated-webhook-request-parsing)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.44%
- **EPSS Percentile:** 36.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._