CVE-2026-105442 Deserialization in WebSphere Application Server
Remote attackers can cause denial of service in IBM WebSphere Application Server via insecure deserialization in the messaging service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105442?
CVE-2026-105442 is a high-severity unsafe deserialization vulnerability in IBM WebSphere Application Server, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.10 Liberty could allow a remote attacker to cause a denial of service caused by an insecure deserialization in the messaging service.
Weakness: CWE-502
Which versions are affected by CVE-2026-105442?
How do I fix CVE-2026-105442?
No fix has been published for CVE-2026-105442 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-105442 being exploited?
There is no known exploitation of CVE-2026-105442 in the wild and no public exploit code.
Sources
Also known as GHSA-5q74-39hp-qp43.