CVE-2026-28394
Received Received - Intake
Denial of Service in OpenClaw Web_Fetch via Malicious HTML

Publication date: 2026-03-05

Last updated on: 2026-03-09

Assigner: VulnCheck

Description
OpenClaw versions prior to 2026.2.15 contain a denial of service vulnerability in the web_fetch tool that allows attackers to crash the Gateway process through memory exhaustion by parsing oversized or deeply nested HTML responses. Remote attackers can social-engineer users into fetching malicious URLs with pathological HTML structures to exhaust server memory and cause service unavailability.
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Meta Information
Published
2026-03-05
Last Modified
2026-03-09
Generated
2026-06-16
AI Q&A
2026-03-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-28394
EUVD
EUVD-2026-9894
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openclaw openclaw to 2026.2.15 (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 2026.2.15 within the web_fetch tool. It is a denial of service (DoS) vulnerability that allows attackers to crash the Gateway process by exhausting its memory. This happens when the tool parses oversized or deeply nested HTML responses.

Remote attackers can exploit this by tricking users into fetching malicious URLs containing pathological HTML structures that consume excessive server memory, leading to service unavailability.

Impact Analysis

The primary impact of this vulnerability is a denial of service condition. Attackers can cause the Gateway process to crash by exhausting its memory resources, resulting in the unavailability of the service.

This can disrupt normal operations, potentially causing downtime and loss of access to services relying on the OpenClaw Gateway.

Compliance Impact

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Detection Guidance

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