CVE-2026-28478
Received Received - Intake
Denial of Service in OpenClaw Webhook Handlers via Oversized Payloads

Publication date: 2026-03-05

Last updated on: 2026-03-17

Assigner: VulnCheck

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.
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Meta Information
Published
2026-03-05
Last Modified
2026-03-17
Generated
2026-06-16
AI Q&A
2026-03-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-28478
EUVD
EUVD-2026-9924
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openclaw openclaw to 2026.2.13 (exc)
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Exploitability
CWE
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KEV
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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.
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Executive Summary

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.

Impact Analysis

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.

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