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Fencer Vulns
high 7.5

CVE-2026-39304 json

Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Incorrect handling of TLSv1.3 KeyUpdate can be exploited to cause DoS via OOM

published 2026-04-10 7 mo ago modified 2026-10-26 13 d ago also BIT-activemq-2026-39304 , EUVD-2026-21362 , GHSA-5568-6qcg-g7fx

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

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.

Patch / fix

  • maven org.apache.activemq:activemq-client 5.19.4, 6.2.4
  • maven org.apache.activemq:activemq-broker 5.19.4, 6.2.4
  • maven org.apache.activemq:activemq-all 5.19.4, 6.2.4
  • maven org.apache.activemq:apache-activemq 5.19.4, 6.2.4
  • bitnami activemq 5.19.4, 6.2.4
  • Apache Software Foundation Apache ActiveMQ Client 5.19.4, 6.2.4
  • Apache Software Foundation Apache ActiveMQ Broker 5.19.4, 6.2.4
  • Apache Software Foundation Apache ActiveMQ All 5.19.4, 6.2.4
  • Apache Software Foundation Apache ActiveMQ 5.19.4, 6.2.4

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-2026-39304 updated cvss 7.5

Apache ActiveMQ Client: Apache ActiveMQ Broker: Apache ActiveMQ: Apache ActiveMQ: Denial of Service due to TLSv1.3 KeyUpdate memory exhaustion

  • Red Hat Fuse 7 activemq-all, activemq-broker, activemq-client
    affected: workaround, no fix planned “Will not fix”
  • Red Hat AMQ Broker 7 activemq-broker, activemq-client Red Hat build of Apache Camel for Spring Boot 4 activemq-client
    not affected: vulnerable code not in execute path
  • Red Hat Data Grid 8 activemq-broker, activemq-client
    not affected: component not present
  • Red Hat Enterprise Linux 8 log4j, log4j-jcl, log4j-web, log4j-slf4j Red Hat Enterprise Linux 9 log4j, log4j-jcl, log4j-slf4j 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
    not affected: vulnerable code not present

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
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.91% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.activemq:activemq-client
<5.19.4
>=6.0.0, <6.2.4
5.19.4
6.2.4
maven org.apache.activemq:activemq-broker
<5.19.4
>=6.0.0, <6.2.4
5.19.4
6.2.4
maven org.apache.activemq:activemq-all
<5.19.4
>=6.0.0, <6.2.4
5.19.4
6.2.4
maven org.apache.activemq:apache-activemq
<5.19.4
>=6.0.0, <6.2.4
5.19.4
6.2.4
bitnami activemq
<5.19.4
>=6.0.0, <6.2.4
5.19.4
6.2.4

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
  • Red Hat Red Hat AMQ Broker 7
  • Red Hat Red Hat build of Apache Camel for Spring Boot 4
  • Red Hat Red Hat Data Grid 8
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Fuse 7
  • Red Hat Red Hat JBoss Enterprise Application Platform 7
  • Red Hat Red Hat JBoss Enterprise Application Platform 8
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling
Technology feeds

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.