CVE-2026-24656: Apache Karaf: Decanter log-socket collector has deserialization vulnerability

[Jean-Baptiste Onofré <jbonofre () apache org>]

Severity: important 

Affected versions:

- Apache Karaf (org.apache.karaf.decanter.collector:org.apache.karaf.decanter.collector.log.socket) before 2.12.0
- Apache Karaf (org.apache.karaf.decanter.collector:org.apache.karaf.decanter.collector.log.socket) 2.12.0 unaffected

Description:

Deserialization of Untrusted Data vulnerability in Apache Karaf Decanter.


The Decanter log socket collector exposes the port 4560, without authentication. If the collector exposes allowed 
classes property, this configuration can be bypassed.
It means that the log socket collector is vulnerable to deserialization of untrusted data, eventually causing DoS.


NB: Decanter log socket collector is not installed by default. Users who have not installed Decanter log socket are not 
impacted by this issue.

This issue affects Apache Karaf Decanter before 2.12.0.

Users are recommended to upgrade to version 2.12.0, which fixes the issue.

This issue is being tracked as https://github.com/apache/karaf-decanter/issues/555 

Credit:

r00t4dm (finder)

References:

https://karaf.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-24656
https://issues.apache.org/jira/browse/https://github.com/apache/karaf-decanter/issues/555