Denial of Service in OpenClaw Webhook Processing
CVE-2026-35640

6.9MEDIUM

Key Information:

Vendor

Openclaw

Status
Openclaw
Vendor
CVE Published:
9 April 2026

What is CVE-2026-35640?

OpenClaw prior to version 2026.3.25 has a vulnerability in its JSON request body handling. The software does not validate webhook signatures before parsing, allowing unauthenticated attackers to exploit this flaw. By sending malicious webhook requests, attackers can force resource-intensive parsing tasks that can lead to server resource exhaustion. This vulnerability can potentially cause a denial of service, interrupting normal application operations.

Affected Version(s)

OpenClaw 0 < 2026.3.25

OpenClaw 2026.3.25

References

https://github.com/openclaw/openclaw/security/advisories/...
third-party-advisory
https://github.com/openclaw/openclaw/commit/5e8cb22176e92...
patch
https://www.vulncheck.com/advisories/openclaw-denial-of-s...
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

tdjackey
.