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TI-2026-28294 Aliases CVE-2026-39304GHSA-5568-6qcg-g7fx

Uncontrolled resource consumption in Apache ActiveMQ Client

Priority MEDIUM 41CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ. ActiveMQ NIO SSL transports do not correctly handle TLSv1.3 handshake KeyUpdates triggered by clients. This makes it possible for a client to rapidly trigger updates which causes the broker to exhaust all its memory in the SSL engine leading to DoS. Note: TLS versions before TLSv1.3 (such as TLSv1.2) are broken but are not vulnerable to OOM. Previous TLS versions require a full handshake renegotiation which causes a connection to hang but not OOM. This is fixed as well. This issue affects Apache ActiveMQ Client: before 5.19.4, from 6.0.0 before 6.2.4; Apache ActiveMQ Broker: before 5.19.4, from 6.0.0 before 6.2.4; Apache ActiveMQ: before 5.19.4, from 6.0.0 before 6.2.4. Users are recommended to upgrade to version 6.2.4 or 5.19.5, which fixes the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00912 60th percentileScored 2026-11-07
Fix Partial Apache ActiveMQ Client (Apache Software Foundation): 5.19.4, 6.2.4Apache ActiveMQ Broker (Apache Software Foundation): 5.19.4, 6.2.4+6 more productsRed Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache ActiveMQ Clientbefore 5.19.4; 6.0.0 to before 6.2.45.19.4, 6.2.4Patch availableCNA
ApacheApache ActiveMQ Brokerbefore 5.19.4; 6.0.0 to before 6.2.45.19.4, 6.2.4Patch availableCNA
ApacheApache ActiveMQ Allbefore 5.19.4; 6.0.0 to before 6.2.45.19.4, 6.2.4Patch availableCNA
ApacheApache ActiveMQbefore 5.19.4; 6.0.0 to before 6.2.45.19.4, 6.2.4Patch availableCNA
—org.apache.activemq:activemq-client (Maven)before 5.19.45.19.4Patch availableGHSA-5568-6qcg-g7fx
—org.apache.activemq:activemq-client (Maven)6.0.0 to before 6.2.46.2.4Patch availableGHSA-5568-6qcg-g7fx
—org.apache.activemq:activemq-broker (Maven)before 5.19.45.19.4Patch availableGHSA-5568-6qcg-g7fx
—org.apache.activemq:activemq-broker (Maven)6.0.0 to before 6.2.46.2.4Patch availableGHSA-5568-6qcg-g7fx
—org.apache.activemq:activemq-all (Maven)before 5.19.45.19.4Patch availableGHSA-5568-6qcg-g7fx
—org.apache.activemq:activemq-all (Maven)6.0.0 to before 6.2.46.2.4Patch availableGHSA-5568-6qcg-g7fx
—org.apache.activemq:apache-activemq (Maven)before 5.19.45.19.4Patch availableGHSA-5568-6qcg-g7fx
—org.apache.activemq:apache-activemq (Maven)6.0.0 to before 6.2.46.2.4Patch availableGHSA-5568-6qcg-g7fx
  • Apache ActiveMQ Client VendorApache Affected before 5.19.4; 6.0.0 to before 6.2.4 Fixed in 5.19.4, 6.2.4 Patch available CNA
  • Apache ActiveMQ Broker VendorApache Affected before 5.19.4; 6.0.0 to before 6.2.4 Fixed in 5.19.4, 6.2.4 Patch available CNA
  • Apache ActiveMQ All VendorApache Affected before 5.19.4; 6.0.0 to before 6.2.4 Fixed in 5.19.4, 6.2.4 Patch available CNA
  • Apache ActiveMQ VendorApache Affected before 5.19.4; 6.0.0 to before 6.2.4 Fixed in 5.19.4, 6.2.4 Patch available CNA
  • org.apache.activemq:activemq-client (Maven) Vendor— Affected before 5.19.4 Fixed in 5.19.4 Patch available GHSA-5568-6qcg-g7fx
  • org.apache.activemq:activemq-client (Maven) Vendor— Affected 6.0.0 to before 6.2.4 Fixed in 6.2.4 Patch available GHSA-5568-6qcg-g7fx
  • org.apache.activemq:activemq-broker (Maven) Vendor— Affected before 5.19.4 Fixed in 5.19.4 Patch available GHSA-5568-6qcg-g7fx
  • org.apache.activemq:activemq-broker (Maven) Vendor— Affected 6.0.0 to before 6.2.4 Fixed in 6.2.4 Patch available GHSA-5568-6qcg-g7fx
  • org.apache.activemq:activemq-all (Maven) Vendor— Affected before 5.19.4 Fixed in 5.19.4 Patch available GHSA-5568-6qcg-g7fx
  • org.apache.activemq:activemq-all (Maven) Vendor— Affected 6.0.0 to before 6.2.4 Fixed in 6.2.4 Patch available GHSA-5568-6qcg-g7fx
  • org.apache.activemq:apache-activemq (Maven) Vendor— Affected before 5.19.4 Fixed in 5.19.4 Patch available GHSA-5568-6qcg-g7fx
  • org.apache.activemq:apache-activemq (Maven) Vendor— Affected 6.0.0 to before 6.2.4 Fixed in 6.2.4 Patch available GHSA-5568-6qcg-g7fx

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*before 5.19.4; 6.0.0 to before 6.2.4VulnerableApache
cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:*before 5.19.4; 6.0.0 to before 6.2.4VulnerableApache
  • cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* Versions before 5.19.4; 6.0.0 to before 6.2.4 Vulnerable ·Apache
  • cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:* Versions before 5.19.4; 6.0.0 to before 6.2.4 Vulnerable ·Apache

Remediation

  • Fix · CNA Apache ActiveMQ Client (Apache Software Foundation) Fixed in 5.19.4, 6.2.4
  • Fix · CNA Apache ActiveMQ Broker (Apache Software Foundation) Fixed in 5.19.4, 6.2.4
  • Fix · CNA Apache ActiveMQ All (Apache Software Foundation) Fixed in 5.19.4, 6.2.4
  • Fix · CNA Apache ActiveMQ (Apache Software Foundation) Fixed in 5.19.4, 6.2.4
  • Fix · GHSA-5568-6qcg-g7fx org.apache.activemq:activemq-client (Maven) Fixed in 5.19.4 Advisory →
  • Fix · GHSA-5568-6qcg-g7fx org.apache.activemq:activemq-client (Maven) Fixed in 6.2.4 Advisory →
  • Fix · GHSA-5568-6qcg-g7fx org.apache.activemq:activemq-broker (Maven) Fixed in 5.19.4 Advisory →
  • Fix · GHSA-5568-6qcg-g7fx org.apache.activemq:activemq-broker (Maven) Fixed in 6.2.4 Advisory →
  • Fix · GHSA-5568-6qcg-g7fx org.apache.activemq:activemq-all (Maven) Fixed in 5.19.4 Advisory →
  • Fix · GHSA-5568-6qcg-g7fx org.apache.activemq:activemq-all (Maven) Fixed in 6.2.4 Advisory →
  • Fix · GHSA-5568-6qcg-g7fx org.apache.activemq:apache-activemq (Maven) Fixed in 5.19.4 Advisory →
  • Fix · GHSA-5568-6qcg-g7fx org.apache.activemq:apache-activemq (Maven) Fixed in 6.2.4 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Fuse 7AffectedNo fix planned: Will not fix
Not affected: 8 products
  • Red Hat AMQ Broker 7
  • Red Hat Data Grid 8
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat JBoss Enterprise Application Platform 7
  • Red Hat JBoss Enterprise Application Platform 8
  • Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat build of Apache Camel for Spring Boot 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39304
  2. 2026-10-03 Alias added: GHSA-5568-6qcg-g7fx

References

Advisory 3

Other 1

  • TI-2023-25106 Deserialization of untrusted data in Apache ActiveMQ KEVCVSS 3.1CRITICAL 10.0
  • TI-2016-02587 The Fileserver web application in Apache ActiveMQ 5.x before 5.14.0 allows remote… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-26494 Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Authenticated users could perform RCE via Jolokia MBeans KEVCVSS 3.1HIGH 8.8
  • TI-2013-05951 Xstream API versions up to 1.4.6 and version 1.4.10, if the security framework has not… CVSS 3.1CRITICAL 9.8
  • TI-2021-04451 XStream is vulnerable to an Arbitrary Code Execution attack CVSS 3.1CRITICAL 9.1
  • TI-2021-04446 XStream is vulnerable to an Arbitrary Code Execution attack CVSS 3.1CRITICAL 9.8
See all 74 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences