CVE-2026-9828

Deserialization of untrusted data vulnerability in QOS.CH Sarl logback logback-core (HardenedObjectInputStream (logback-core) modules) allows Object Injection albeit heavily restricted.

More precisely, an attacker able to influence serialized data sent to 
SimpleSocketServer or SimpleSSLSocketServer can instantiate objects from
 classes in the java.lang and java.util packages that are not explicitly
 blocked.

Although deserialization is heavily restricted by HardenedObjectInputStream and no 
practical way to achieve remote code execution or significant privilege 
escalation has been identified, this issue constitutes a bypass of the 
intended security restrictions.



This issue affects logback: through 1.5.32 inclusive.