CVE-2026-34197
Apache ActiveMQ Improper Input Validation Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 30 April 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 98.26% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 16 April 2026 · due 30 April 2026
- Weakness
- CWE-20, CWE-94, CWE-78
- Affected
- apache/activemq · apache/activemq broker
- Source
- security@apache.org
EPSS moved from 15.5% on 24 September 2026 to 98.3% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txt ; https://nvd.nist.gov/vuln/detail/CVE-2026-34197
References
- https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txtVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/06/3Mailing List, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2026-34197Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2455869Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34197.jsonThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34197US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.