CVE-2026-34197

What is CVE-2026-34197?

Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ. Apache ActiveMQ Classic exposes the Jolokia JMX-HTTP bridge at /api/jolokia/ on the web console. The default Jolokia access policy permits exec operations on all ActiveMQ MBeans (org.apache.activemq:*), including BrokerService.addNetworkConnector(String) and BrokerService.addConnector(String). An authenticated attacker can invoke these operations with a crafted discovery URI that triggers the VM transport's brokerConfig parameter to load a remote Spring XML application context using ResourceXmlApplicationContext. Because Spring's ResourceXmlApplicationContext instantiates all singleton beans before the BrokerService validates the configuration, arbitrary code execution occurs on the broker's JVM through bean factory methods such as Runtime.exec(). This issue affects Apache ActiveMQ Broker: before 5.19.4, from 6.0.0 before 6.2.3; Apache ActiveMQ All: before 5.19.4, from 6.0.0 before 6.2.3; Apache ActiveMQ: before 5.19.4, from 6.0.0 before 6.2.3. Users are recommended to upgrade to version 5.19.4 or 6.2.3, which fixes the issue

Timeline

• 2026-04-07Published to the U.S. National Vulnerability Database (NVD)
• 2026-04-16Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
• 2026-04-17First covered in a defend.network daily briefing
• 2026-04-30CISA federal remediation deadline (BOD 22-01)
• 2026-08-04NVD record last updated

CISA Known Exploited Vulnerability

Apache ActiveMQ Improper Input Validation Vulnerability

Affected product

Apache ActiveMQ

NVD also lists CPE entries for: Apache Activemq, Apache Activemq Broker

References

• https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txt
• http://www.openwall.com/lists/oss-security/2026/04/06/3
• https://access.redhat.com/security/cve/CVE-2026-34197
• https://nvd.nist.gov/vuln/detail/CVE-2026-34197
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Referenced in our briefings & reports

• Microsoft Defender & ActiveMQ zero-days under exploitation (2026-04-18)
• Apache ActiveMQ exploited; Defender zero-day; ZionSiphon hits water (2026-04-17)

Related vulnerabilities

• CVE-2026-23918 – Apache Http Server (same vendor)
• CVE-2026-34486 – Apache Tomcat (same vendor)
• CVE-2016-3081 – Apache Struts (same vendor)
• CVE-2026-99999 (same weakness: CWE-20)
• CVE-2026-106931 – EG Secure Solutions SiteGuard Server Edition (same weakness: CWE-78)
• CVE-2026-110447 – Collabora Online – Built-In CODE Server (same weakness: CWE-78)

Apache: 41 known exploited vulnerabilities (CISA KEV) →