Review reviewHigh

CVE-2026-9320

IBM WebSphere Application Server, WebSphere Application Server - Liberty, websphere application server

IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are vulnerable to a denial of service, caused by sending a specially-crafted request. A remote attacker could exploit this vulnerability to cause the server to consume memory resources.

CVSS: 7.5
EPSS: 0.32%
CISA KEV: Not listed
Published: 2026.06.23

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.32%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: IBM WebSphere Application Server, WebSphere Application Server - Liberty, websphere application server
Affected versions: 9.0.0, 8.5.0, 17.0.0.3, >= 8.5.0.0 < 8.5.5.30, >= 9.0.0.0 < 9.0.5.29, >= 17.0.0.3 < 26.0.0.7
Fixed versions: 8.5.5.30, 9.0.5.29, 26.0.0.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that IBM WebSphere Application Server, WebSphere Application Server - Liberty, websphere application server and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-400