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Fencer Vulns
medium 4.3

CVE-2026-33227 json

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

published 2026-04-07 7 mo ago modified 2026-10-26 13 d ago also BIT-activemq-2026-33227 , EUVD-2026-19586 , GHSA-h2h4-5m64-m273

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.apache.activemq:activemq-client 5.19.3, 6.2.2
  • maven org.apache.activemq:activemq-broker 5.19.3, 6.2.2
  • maven org.apache.activemq:activemq-all 5.19.3, 6.2.2
  • maven org.apache.activemq:activemq-web 5.19.3, 6.2.2
  • bitnami activemq 5.19.3, 6.2.2
  • Apache Software Foundation Apache ActiveMQ Client 5.19.3, 6.2.2
  • Apache Software Foundation Apache ActiveMQ Broker 5.19.3, 6.2.2
  • Apache Software Foundation Apache ActiveMQ All 5.19.3, 6.2.2
  • Apache Software Foundation Apache ActiveMQ Web 5.19.3, 6.2.2
  • Apache Software Foundation Apache ActiveMQ 5.19.3, 6.2.2

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33227 updated cvss 4.3

org.apache.activemq/activemq-client: org.apache.activemq/activemq-broker: org.apache.activemq/activemq-all: org.apache.activemq/activemq-web: improper limitation of a pathname to a restricted classpat

  • Red Hat AMQ Broker 7 activemq-broker, activemq-client Red Hat build of Apache Camel for Spring Boot 4 activemq-client Red Hat Data Grid 8 activemq-broker, activemq-client Red Hat Enterprise Linux 8 log4j, log4j-jcl, log4j-web, log4j-slf4j
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 9 log4j, log4j-jcl, log4j-slf4j
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Fuse 7 activemq-all, activemq-web, activemq-broker, activemq-client Red Hat JBoss Enterprise Application Platform 7 activemq-broker, activemq-client Red Hat JBoss Enterprise Application Platform 8 activemq-broker, activemq-client Red Hat JBoss Enterprise Application Platform Expansion Pack activemq-broker, activemq-client
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
OSV 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.activemq:activemq-client
<5.19.3
>=6.0.0, <6.2.2
5.19.3
6.2.2
maven org.apache.activemq:activemq-broker
<5.19.3
>=6.0.0, <6.2.2
5.19.3
6.2.2
maven org.apache.activemq:activemq-all
<5.19.3
>=6.0.0, <6.2.2
5.19.3
6.2.2
maven org.apache.activemq:activemq-web
<5.19.3
>=6.0.0, <6.2.2
5.19.3
6.2.2
bitnami activemq
<5.19.3
>=6.0.0, <6.2.2
5.19.3
6.2.2

Affected products

  • Apache Software Foundation Apache ActiveMQ Client
  • Apache Software Foundation Apache ActiveMQ Broker
  • Apache Software Foundation Apache ActiveMQ All
  • Apache Software Foundation Apache ActiveMQ Web
  • Apache Software Foundation Apache ActiveMQ

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.