Apache Karaf: Improper release of ClassLoader references via static ThreadLocal caching (CVE-2026-92230) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-92230

Apache Karaf: Improper release of ClassLoader references via static ThreadLocal caching

Answer in brief

CVE-2026-92230 records a Unknown severity vulnerability in Apache Karaf: Improper release of ClassLoader references via static ThreadLocal caching. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache Karaf (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache Karaf (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Apache Software Foundation/Apache Karafgeneric	>=0 <4.4.11	4.4.11

Recommended response

Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache Karaf.
Review the reported fix. Update Apache Software Foundation/Apache Karaf to 4.4.11 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.