CVE-2026-9336
Undergoing Analysis Undergoing Analysis - In Progress

Denial of Service in IBM WebSphere Application Server

Publication date: 2026-09-10

Last updated on: 2026-09-10

Assigner: IBM Corporation

Description
IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to a denial of service, caused by sending a specially-crafted HTTP request to an administrative endpoint. A remote attacker could exploit this vulnerability to cause the server to exhaust filesystem space.

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Meta Information

Published
2026-09-10
Last Modified
2026-09-10
Generated
2026-09-10
AI Q&A
2026-09-10
EPSS Evaluated
N/A
NVD
CVE-2026-9336
EUVD
EUVD-2026-75677

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
ibm websphere_application_server to 9.0.5.29 (exc)
ibm websphere_application_server to 8.5.5.31 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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Executive Summary

This vulnerability is a denial of service flaw in IBM WebSphere Application Server versions 9.0 and 8.5. A remote attacker can send a specially crafted HTTP request to an administrative endpoint, causing the server to exhaust filesystem space and disrupt service availability.

Detection Guidance

Monitor filesystem usage on WebSphere Application Server hosts, particularly in directories where logs or temporary files are stored. Check for unusual HTTP requests targeting administrative endpoints by reviewing web server access logs for patterns like repeated requests to /admin or similar paths.

Impact Analysis

The vulnerability allows an attacker to crash or severely degrade the performance of the WebSphere Application Server by consuming all available filesystem space. This can lead to service outages, downtime, and potential loss of access to critical applications relying on the server.

Mitigation Strategies

Apply the recommended Fix Packs: upgrade to WebSphere Application Server 9.0.5.29 or later, or 8.5.5.31 or later. If immediate patching is not possible, restrict network access to administrative endpoints using firewalls or network segmentation.

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