HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-13759 — IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStrea...

·Source: NIST NVD

Updated:

Executive Summary

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-lo

Analysis

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 CVSS Score: 7.5. Published: 2026-06-30T20:17:28.953.

Indicators of Compromise (3)

CVE (1)
CVE-2026-13759
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Jun 30, 2026. Verified by: NIST.

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