CVE-2026-13759 IBM WebSphere eXtreme Scale is affected by Insecure Deserilization

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...

CVE-2026-13759

CVE-2026-13759 affects IBM WebSphere eXtreme Scale (WebSphere Extreme Scale) 8.6.1.0–8.6.1.6. The root cause is insecure deserialization: three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) ship without a JEP-290 class filter. ...

CVE-2026-13759

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...

EUVD-2026-40388

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...

CVE-2026-13759 IBM WebSphere eXtreme Scale is affected by Insecure Deserilization

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...

CVE-2026-13772

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 's Object Query Language engine resolves attacker-supplied class names via Class.forName and invokes their constructors with no allow-list at three distinct sinks SELECT NEW, enum literals, and reflection-based comparators; an authenticated remo...

CVE-2026-13772

CVE-2026-13772 affects IBM WebSphere eXtreme Scale (OQL engine) on versions 8.6.1.0–8.6.1.6. The issue arises from attacker-supplied class names being resolved via Class.forName() and their constructors invoked at three sinks (SELECT NEW, enum literals, reflection-based comparators) without an al...

EUVD-2026-40387

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 's Object Query Language engine resolves attacker-supplied class names via Class.forName and invokes their constructors with no allow-list at three distinct sinks SELECT NEW, enum literals, and reflection-based comparators; an authenticated remo...

CVE-2026-13772 IBM WebSphere eXtreme Scale's OQL is affected by remote code execution

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 's Object Query Language engine resolves attacker-supplied class names via Class.forName and invokes their constructors with no allow-list at three distinct sinks SELECT NEW, enum literals, and reflection-based comparators; an authenticated remo...

CVE-2026-13772 IBM WebSphere eXtreme Scale's OQL is affected by remote code execution

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 's Object Query Language engine resolves attacker-supplied class names via Class.forName and invokes their constructors with no allow-list at three distinct sinks SELECT NEW, enum literals, and reflection-based comparators; an authenticated remo...

CVE-2026-13773 IBM WebSphere eXtreme Scale is affected by server side request forgery when ORB is used as Transport Protocol

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 Approximately 50 generated CORBA stub classes in WebSphere eXtreme Scale's ogclient.jar call ORB.stringtoobject on an attacker-controlled IOR string during Java deserialization, turning any unfiltered ObjectInputStream sink in WAS into outbound...

CVE-2026-13773

CVE-2026-13773 affects IBM WebSphere eXtreme Scale 8.6.1.0–8.6.1.6. Approximately 50 generated CORBA stub classes in ogclient.jar deserialize an attacker-controlled IOR via ObjectInputStream, using ORB.string_to_object() to perform outbound IIOP SSRF to a chosen host. When combined with IBM ORB g...

CVE-2026-13773 IBM WebSphere eXtreme Scale is affected by server side request forgery when ORB is used as Transport Protocol

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 Approximately 50 generated CORBA stub classes in WebSphere eXtreme Scale's ogclient.jar call ORB.stringtoobject on an attacker-controlled IOR string during Java deserialization, turning any unfiltered ObjectInputStream sink in WAS into outbound...

CVE-2026-13773

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 Approximately 50 generated CORBA stub classes in WebSphere eXtreme Scale's ogclient.jar call ORB.stringtoobject on an attacker-controlled IOR string during Java deserialization, turning any unfiltered ObjectInputStream sink in WAS into outbound...

EUVD-2026-40386

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 Approximately 50 generated CORBA stub classes in WebSphere eXtreme Scale's ogclient.jar call ORB.stringtoobject on an attacker-controlled IOR string during Java deserialization, turning any unfiltered ObjectInputStream sink in WAS into outbound...

CVE-2026-9002

IBM WebSphere eXtremes Scale is affected in versions 8.6.1.0–8.6.1.6 by an XDF decoder validation issue. The decoder may mishandle deeply nested Protocol Buffers messages and attacker-controlled length prefixes without proper bounds checking, enabling an adjacent attacker to trigger StackOverflow...

CVE-2026-9002 IBM WebSphere eXtremes Scale is affected by uncontrolled resource consumption when XDF is enabled

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 could allow an adjacent attacker to cause a denial of service due to improper validation in the XDF decoder. The application processes deeply nested Protocol Buffers messages and attacker-controlled length prefixes without sufficient bounds...

CVE-2026-9002

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 could allow an adjacent attacker to cause a denial of service due to improper validation in the XDF decoder. The application processes deeply nested Protocol Buffers messages and attacker-controlled length prefixes without sufficient bounds...

EUVD-2026-40379

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 could allow an adjacent attacker to cause a denial of service due to improper validation in the XDF decoder. The application processes deeply nested Protocol Buffers messages and attacker-controlled length prefixes without sufficient bounds...

CVE-2026-9002 IBM WebSphere eXtremes Scale is affected by uncontrolled resource consumption when XDF is enabled

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 could allow an adjacent attacker to cause a denial of service due to improper validation in the XDF decoder. The application processes deeply nested Protocol Buffers messages and attacker-controlled length prefixes without sufficient bounds...