What’s Vulnerable › Vulnerabilities

CVE-2026-92230: Apache Karaf: Improper release of ClassLoader references via static ThreadLocal caching

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-09-18
• Weakness: CWE-401

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.

Affected products

• Apache Software Foundation Apache Karaf: before 4.4.11 — fixed in 4.4.11

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Karaf 4.4.11. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/pxgqjvsmzgpvgly1qf1w300qxsp8bxdj
• http://www.openwall.com/lists/oss-security/2026/09/17/3

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