CVE WatchOct 20, 2026

CVE-2026-101292

Apache ActiveMQ Artemis before 2.34.0 contains an unsafe reflection vulnerability in FederationStreamConnectMessage.getFederationPolicy(). T

CVSS

8.2

High

EPSS

0.5%

p44

KEV

—

Exploit Today

0-100

Published: Sep 28, 2026 · Last modified: Oct 20, 2026 · CWE-470

EPSS · 30d

0.4%EPSS · 30 days0.5%

2026-09-292026-10-25

Technical description

Apache ActiveMQ Artemis before 2.34.0 contains an unsafe reflection vulnerability in FederationStreamConnectMessage.getFederationPolicy(). The method calls Class.forName(clazz).getConstructor().newInstance() where clazz is read directly from the CORE protocol wire buffer without type validation. An authenticated federation peer can send a FEDERATION_DOWNSTREAM_CONNECT packet with a crafted class name, causing the broker to load and instantiate arbitrary classes visible to the Artemis module classloader. Static initializers (<clinit>) and no-argument constructors (<init>()) execute as side effects before the type cast, enabling denial of service via system-property poisoning, out-of-memory conditions via classloading, or broker state manipulation.

Official references

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