CVE-2026-33227
Description
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
org.apache.activemq:activemq-clientMaven | < 5.19.3 | 5.19.3 |
org.apache.activemq:activemq-clientMaven | >= 6.0.0, < 6.2.2 | 6.2.2 |
org.apache.activemq:activemq-brokerMaven | < 5.19.3 | 5.19.3 |
org.apache.activemq:activemq-brokerMaven | >= 6.0.0, < 6.2.2 | 6.2.2 |
org.apache.activemq:activemq-allMaven | < 5.19.3 | 5.19.3 |
org.apache.activemq:activemq-allMaven | >= 6.0.0, < 6.2.2 | 6.2.2 |
org.apache.activemq:activemq-webMaven | < 5.19.3 | 5.19.3 |
org.apache.activemq:activemq-webMaven | >= 6.0.0, < 6.2.2 | 6.2.2 |
Affected products
3Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- www.openwall.com/lists/oss-security/2026/04/06/4nvdMailing ListThird Party AdvisoryWEB
- activemq.apache.org/security-advisories.data/CVE-2026-33227-announcement.txtnvdVendor AdvisoryWEB
- github.com/advisories/GHSA-h2h4-5m64-m273ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33227ghsaADVISORY
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