CVE-2026-24656 Apache Karaf: Decanter log-socket collector has deserialization vulnerability
Unauthenticated deserialization in Apache Karaf Decanter log socket collector can cause denial of service if the optional collector is installed.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-24656?
CVE-2026-24656 is a low-severity unsafe deserialization vulnerability in Apache Karaf, published on 26 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-24656?
2 open source packages ship an affected version, including org.apache.karaf.decanter.collector:org.apache.karaf.decanter.collector.log.socket. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.apache.karaf.decanter.collector:org.apache.karaf.decanter.collector.log.socket Maven | All versions | 2.12.0 |
org.apache.karaf.decanter.collector:org.apache.karaf.decanter.collector.log.socket Maven | All versions | 2.12.0 |
Products include Apache Karaf Decanter.
How do I fix CVE-2026-24656?
Upgrade org.apache.karaf.decanter.collector:org.apache.karaf.decanter.collector.log.socket to 2.12.0 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-24656 being exploited?
There is no known exploitation of CVE-2026-24656 in the wild and no public exploit code.
Sources
Also known as GHSA-jmw5-58c7-587h.