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CVE-2026-13759

nvd nist
Published: Jun 30, 2026Modified: Jul 3, 2026

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8.8
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 2.8 / Impact: 5.9
Source: NVD

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 (1)

Ibm
1 product
Websphere Extreme Scale
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Websphere Extreme Scale
From 8.6.1.0 to 8.6.1.6

Related CWEs

CWE-502
Deserialization of Untrusted Data
The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

References (1)

Source: psirt@us.ibm.com
Vendor Advisory

Timeline

No history available yet.