CVE-2026-92230 Apache Karaf: Improper release of ClassLoader references via static ThreadLocal caching
Attackers can cause denial of service in Apache Karaf by triggering memory leaks through repeated bundle operations that pin ClassLoaders in memory.
- 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-2026-92230?
CVE-2026-92230 is a high-severity denial of service vulnerability in Apache Karaf, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Apache Karaf's XmlUtils cached XML parser/transformer factories in static ThreadLocal fields on long-lived container threads. Because a ThreadLocal value outlives the OSGi bundle that created it, repeated bundle or feature install, update, or refresh operations can leave successive bundle ClassLoader's pinned in memory and unreachable for garbage collection, leading to unbounded Metaspace growth and eventual denial of service of the Karaf instance.
Which versions are affected by CVE-2026-92230?
How do I fix CVE-2026-92230?
No fix has been published for CVE-2026-92230 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-92230 being exploited?
There is no known exploitation of CVE-2026-92230 in the wild and no public exploit code.
Sources
Also known as GHSA-3c25-9cqf-vxfc.