NVD

CVE-2026-13759 Detail

Undergoing Enrichment

This CVE record is currently being enriched by team members, this process results in the association of reference link tags, CVSS, CWE, and CPE applicability statement data

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

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

Nist CVSS score does not match with CNA score

CNA: IBM Corporation

Base Score: 7.5 HIGH

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://www.ibm.com/support/pages/node/7278595	IBM Corporation

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-502	Deserialization of Untrusted Data	IBM Corporation

Change History

2 change records found show changes

New CVE Received from IBM Corporation 6/30/2026 4:17:28 PM

Action	Type	New Value
Added	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
Added	CVSS V3.1	AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-502
Added	Reference	https://www.ibm.com/support/pages/node/7278595
Added	Affected	[{"vendor":"IBM","product":"WebSphere Extreme Scale","cpes":["cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.0:::::::","cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.6:::::::"],"versions":[{"version":"8.6.1.0","lessThanOrEqual":"8.6.1.6","versionType":"semver","status":"affected"}]}]

Quick Info

CVE Dictionary Entry:
CVE-2026-13759
NVD Published Date:
06/30/2026
NVD Last Modified:
07/01/2026
Source:
IBM Corporation

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Information Technology Laboratory

National Vulnerability Database