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IBM i Java 8 Vulnerability Causes Key Generation Failure

IBM i Java 8 Vulnerability Causes Key Generation Failure

First seen 2 Nov 2026, 12:46 UTC • •
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ThreatCluster AI
ThreatCluster •November 2, 2026 at 14:16 UTC
  • •Java 8 VMs on IBM i are failing after PTF updates.
  • •The error affects multiple IBM i applications and versions.
  • •Users need to apply a resolving PTF or workarounds to mitigate the issue.

IBM i Java Development Kit (JDK) 8 64-bit and 32-bit VMs are failing after the application of specific PTF levels, resulting in the error 'Could not generate ECDHEMLKEM keypair'. This issue affects IBM i versions 7.3, 7.4, 7.5, and 7.6, specifically those upgraded to SR8 FP55. The failure impacts various applications including the IBM i Administration server, Integrated Web Services, and WebSphere Application Server. Affected PTF levels include SF99965 for 7.6, SF99955 for 7.5, SF99665 for 7.4, and SF99725 for 7.3. Users experiencing this issue are advised to apply a resolving PTF or implement recommended workarounds. The vulnerability is not classified as a, and other JDK versions (11, 17, 21) are unaffected. The issue was confirmed by IBM on November 2, 2026.

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Timeline

2026-11-02
IBM confirms Java 8 failure
IBM disclosed that JDK 8 VMs fail with a specific error after PTF updates, affecting several IBM i versions.
www.ibm.com

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Common questions

Which IBM i versions are affected?
IBM i versions 7.3, 7.4, 7.5, and 7.6 with Java 8 SR8 FP55 are affected.
What should I do if I encounter this error?
You should apply the resolving PTF or implement one of the recommended workarounds provided by IBM.
Is this issue being actively exploited?
No, the issue is not classified as a zero-day and there is no evidence of active exploitation.