CVE-2026-9320: IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities

Published Jun 16, 2026
·
Updated

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.

Other sources

IBM WebSphere Application Server and WebSphere Application Server Liberty 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.

— IBM

Affected Software

11 affected components
All of the following
Any of the following
IBM WebSphere Application Server>=8.5.0.0<8.5.5.30
IBM WebSphere Application Server>=9.0.0.0<9.0.5.29
IBM WebSphere Application Server>=17.0.0.3<26.0.0.7
Any of the following
Apple macOS
IBM AIX
IBM i
IBM Z\/os
Linux Linux kernel
Microsoft Windows
IBM PowerVM Novalink<=2.2.02.2.12.2.1.1
IBM PowerVM Novalink<=2.3.02.3.0.12.3.12.3.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade IBM WebSphere Application Server Liberty to a version that resolves this vulnerability.

    Fixed in 26.0.0.7
  2. Upgrade

    Upgrade IBM WebSphere Application Server to a version that resolves this vulnerability.

    Fixed in 8.5.5.30
  3. Upgrade

    Upgrade IBM WebSphere Application Server to a version that resolves this vulnerability.

    Fixed in 9.0.5.29
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch PH71370
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch PH71631

Event History

Jun 22, 2026
CVE Published
via MITRE·02:53 PM
Data Sourced
via MITRE·02:53 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·04:16 PM
DescriptionSeverityWeaknessAffected Software
Jul 16, 2026
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software
Apr 11, 58531
Event
via FIRST·07:45 AM

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2026-9320?

The severity of CVE-2026-9320 is high with a score of 7.5.

2

What products are affected by CVE-2026-9320?

CVE-2026-9320 affects IBM WebSphere Application Server 9.0, 8.5, and IBM WebSphere Application Server - Liberty versions 17.0.0.3 through 26.0.0.6.

3

How do I fix CVE-2026-9320?

To mitigate CVE-2026-9320, it is recommended to update to the latest version of IBM WebSphere Application Server or apply the relevant security patches.

4

What type of attack does CVE-2026-9320 enable?

CVE-2026-9320 enables a denial of service attack, which can cause the server to consume excessive memory resources.

5

What is the exploitability of CVE-2026-9320?

CVE-2026-9320 has an exploitability score of 0.00323, indicating a low likelihood of exploitation.

Company

Resources

Contact

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