Is CVE-2026-9002 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-9002 being exploited in the wild.

How severe is CVE-2026-9002?

Medium severity, with a CVSS score of 6.5, published 30 June 2026.

Which products and versions are affected?

IBM Websphere Extreme Scale 8.6.1.0 - 8.6.1.6.

Is there a fix for CVE-2026-9002?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-9002 attacked?

It is attacked from the adjacent network, in a software library.

Am I affected by CVE-2026-9002?

Check whether you run IBM Websphere Extreme Scale at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-9002: IBM WebSphere Extreme Scale denial of service in XDF decoder

CVE-2026-9002 · Severity: medium · CVSS 6.5 · Published 2026-06-30

IBM WebSphere Extreme Scale, a high-performance data caching solution, is vulnerable to a denial-of-service attack. An attacker on the same local network can send specially crafted data that causes the application to crash by exhausting its memory or processing capacity. This results in a service outage, preventing legitimate users and applications from accessing cached data.

Technologies: IBM Websphere Extreme Scale. Vendors: IBM.

Quick answers

Is CVE-2026-9002 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-9002 being exploited in the wild.
How severe is CVE-2026-9002?: Medium severity, with a CVSS score of 6.5, published 30 June 2026.
Which products and versions are affected?: IBM Websphere Extreme Scale 8.6.1.0 - 8.6.1.6.
Is there a fix for CVE-2026-9002?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-9002 attacked?: It is attacked from the adjacent network, in a software library.
Am I affected by CVE-2026-9002?: Check whether you run IBM Websphere Extreme Scale at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

IBM WebSphere Extreme Scale (versions 8.6.1.0 through 8.6.1.6) contains an uncontrolled resource consumption vulnerability (CWE-400) within its XDF decoder. The component fails to perform sufficient bounds checking on attacker-controlled length prefixes and deeply nested Protocol Buffers messages. An adjacent attacker can exploit this by sending malicious messages that trigger a StackOverflowError or OutOfMemoryError, leading to a crash of the WebSphere Application Server JVM. IBM has released APAR PH71946 to address this issue; users on 8.6.1.6 should apply the iFix, while those on older versions must first upgrade to 8.6.1.6.

Affected products

IBM WebSphere Extreme Scale 8.6.1.0 - 8.6.1.6

Timeline

2026-06-29: advisory: Initial publication by IBM
2026-06-30: disclosed: NVD publication date

References

https://www.ibm.com/support/pages/node/7278346

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