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High severity7.5NVD Advisory· Published Jun 30, 2026· Updated Jul 3, 2026

CVE-2026-13759

CVE-2026-13759

Description

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) that install no JEP-290 class filter; when Coherence is on the classpath, multiple RCE gadget chains including RemoteConstructor.readResolve and PriorityQueue/ExtractorComparator are confirmed working, allowing a post-login attacker who can write a session attribute or a LAN-adjacent attacker on the grid replication wire to execute arbitrary code on peer WAS JVMs

Affected products

2
  • IBM/Websphere Extreme Scale2 versions
    cpe:2.3:a:ibm:websphere_extreme_scale:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:ibm:websphere_extreme_scale:*:*:*:*:*:*:*:*range: >=8.6.1.0,<=8.6.1.6
    • (no CPE)range: 8.6.1.0 - 8.6.1.6

Patches

Vulnerability mechanics

References

1

News mentions

0

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