CVE-2026-13759

HighCVSS 8.8/10Last modified Oct 25, 2026

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

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-502

Affected software

VendorProductVersions
IBMWebSphere Extreme Scale>= 8.6.1.0, <= 8.6.1.6

References

Timeline

Published
Jun 30, 2026
Last modified
Oct 25, 2026
NVD status
Analyzed

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CVE-2026-13759: High severity, CVSS 8.8 | Vulnix