Medium 4.3Published Apr 7, 2026

CVE-2026-33227Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ Web, Apache ActiveMQ: Improper Limitation of a Pathname to a Restricted Classpath Directory

Updated under an hour ago (Oct 26, 2026, 7:00 PM ET)

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It affects Apache Software Foundation Apache ActiveMQ Client and 7 other products. Add what you run to find out whether that includes you.

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Every CVE for Apache Software Foundation Apache ActiveMQ Client

Exploited in the last 30 days

Improper validation and restriction of a classpath path name vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ Web, Apache ActiveMQ. In two instances (when creating a Stomp consumer and also browsing messages in the Web console) an authenticated user provided "key" value could be constructed to traverse the classpath due to path concatenation. As a result, the application is exposed to a classpath path resource loading vulnerability that could potentially be chained together with another attack to lead to exploit. This issue affects Apache ActiveMQ Client: before 5.19.3, from 6.0.0 before 6.2.2; Apache ActiveMQ Broker: before 5.19.3, from 6.0.0 before 6.2.2; Apache ActiveMQ All: before 5.19.3, from 6.0.0 before 6.2.2; Apache ActiveMQ Web: before 5.19.3, from 6.0.0 before 6.2.2; Apache ActiveMQ: before 5.19.3, from 6.0.0 before 6.2.2. Users are recommended to upgrade to version 5.19.4 or 6.2.3, which fixes the issue. Note: 5.19.3 and 6.2.2 also fix this issue, but that is limited to non-Windows environments due to a path separator resolution bug fixed in 5.19.4 and 6.2.3.

CVSS: 4.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-22
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: apache
NVD analysis: Analyzed
Record last updated: Apr 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache ActiveMQ Client apache_software_foundation:apache_activemq_client (from the name)	before 5.19.3; from 6.0.0 before 6.2.2	CNA record
Apache Software Foundation Apache ActiveMQ Broker apache_software_foundation:apache_activemq_broker (from the name)	before 5.19.3; from 6.0.0 before 6.2.2	CNA record
Apache Software Foundation Apache ActiveMQ All apache_software_foundation:apache_activemq_all (from the name)	before 5.19.3; from 6.0.0 before 6.2.2	CNA record
Apache Software Foundation Apache ActiveMQ Web apache_software_foundation:apache_activemq_web (from the name)	before 5.19.3; from 6.0.0 before 6.2.2	CNA record
Apache Software Foundation Apache ActiveMQ apache_software_foundation:apache_activemq (from the name)	before 5.19.3; from 6.0.0 before 6.2.2	CNA record
apache activemq apache:activemq	before 5.19.3; from 6.0.0 before 6.2.2	NVD
apache activemq_broker apache:activemq_broker	before 5.19.3; from 6.0.0 before 6.2.2	NVD
apache activemq_web apache:activemq_web	before 5.19.3; from 6.0.0 before 6.2.2	NVD

References

References

https://activemq.apache.org/security-advisories.data/CVE-2026-33227-announcement.txt	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/04/06/4	mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.