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. ...