CVE-2026-13759
IBM WebSphere eXtreme Scale is affected by Insecure Deserilization
- State
- Published
- Severity
- 7.5 High
- Published
- Jun 30, 2026
- Updated
- Jul 3, 2026
- Reserved
- Jun 29, 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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | ibm |
Weaknesses
- CWE-502 Deserialization of Untrusted Data
Affected Products
| Product | Versions |
|---|---|
WebSphere Extreme ScaleIBM |
|
References
- https://www.ibm.com/support/pages/node/7278595vendor-advisorypatch
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