CVE-2026-28478
Denial of Service in OpenClaw Webhook Handlers via Oversized Payloads
Publication date: 2026-03-05
Last updated on: 2026-03-17
Assigner: VulnCheck
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| openclaw | openclaw | to 2026.2.13 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-770 | The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in OpenClaw versions prior to 2026.2.13 and involves a denial of service issue in webhook handlers. These handlers buffer request bodies without enforcing strict limits on the size or time of the data received. As a result, remote unauthenticated attackers can exploit this by sending oversized JSON payloads or very slow uploads to webhook endpoints, which causes excessive memory usage and degrades the availability of the service.
How can this vulnerability impact me? :
The impact of this vulnerability is a denial of service condition. Attackers can cause memory pressure and degrade the availability of the affected OpenClaw service by sending large or slow webhook requests. This can lead to service interruptions or outages, affecting the reliability and accessibility of the system.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know