AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-770

https://access.redhat.com/security/cve/CVE-2026-39304

https://bugzilla.redhat.com/show_bug.cgi?id=2457275

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39304.json

[{"vendor":"Red Hat","product":"Red Hat Fuse 7","defaultStatus":"affected","cpes":["cpe:/a:redhat:jboss_fuse:7"]},{"vendor":"Red Hat","product":"Red Hat AMQ Broker 7","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:amq_broker:7"]},{"vendor":"Red Hat","product":"Red Hat build of Apache Camel for Spring Boot 4","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:camel_spring_boot:4"]},{"vendor":"Red Hat","product":"Red Hat Data Grid 8","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:jboss_data_grid:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","defaultStatus":"unaffected","cpes":["cpe:/o:redhat:enterprise_linux:9"]},{"vendor":"Red Hat","product":"Red Hat JBoss Enterprise Application Platform 7","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:7"]},{"vendor":"Red Hat","product":"Red Hat JBoss Enterprise Application Platform 8","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:8"]},{"vendor":"Red Hat","product":"Red Hat JBoss Enterprise Application Platform Expansion Pack","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:jbosseapxp"]}]

{"timestamp":"2026-04-10T14:10:10.616689Z","id":"CVE-2026-39304","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"Apache Software Foundation","product":"Apache ActiveMQ Client","defaultStatus":"unaffected","collectionURL":"https://repo.maven.apache.org/maven2","packageName":"org.apache.activemq:activemq-client","versions":[{"version":"0","lessThan":"5.19.4","versionType":"semver","status":"affected"},{"version":"6.0.0","lessThan":"6.2.4","versionType":"semver","status":"affected"}]},{"vendor":"Apache Software Foundation","product":"Apache ActiveMQ Broker","defaultStatus":"unaffected","collectionURL":"https://repo.maven.apache.org/maven2","packageName":"org.apache.activemq:activemq-broker","versions":[{"version":"0","lessThan":"5.19.4","versionType":"semver","status":"affected"},{"version":"6.0.0","lessThan":"6.2.4","versionType":"semver","status":"affected"}]},{"vendor":"Apache Software Foundation","product":"Apache ActiveMQ All","defaultStatus":"unaffected","collectionURL":"https://repo.maven.apache.org/maven2","packageName":"org.apache.activemq:activemq-all","versions":[{"version":"0","lessThan":"5.19.4","versionType":"semver","status":"affected"},{"version":"6.0.0","lessThan":"6.2.4","versionType":"semver","status":"affected"}]},{"vendor":"Apache Software Foundation","product":"Apache ActiveMQ","defaultStatus":"unaffected","collectionURL":"https://repo.maven.apache.org/maven2","packageName":"org.apache.activemq:apache-activemq","versions":[{"version":"0","lessThan":"5.19.4","versionType":"semver","status":"affected"},{"version":"6.0.0","lessThan":"6.2.4","versionType":"semver","status":"affected"}]}]

OR
          *cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* versions up to (excluding) 5.19.4
          *cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:* versions up to (excluding) 5.19.4
          *cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* versions from (including) 6.0.0 up to (excluding) 6.2.4
          *cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:* versions from (including) 6.0.0 up to (excluding) 6.2.4

Apache Software Foundation: https://activemq.apache.org/security-advisories.data/CVE-2026-39304-announcement.txt Types: Vendor Advisory

CVE: http://www.openwall.com/lists/oss-security/2026/04/09/17 Types: Mailing List, Third Party Advisory

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-400

http://www.openwall.com/lists/oss-security/2026/04/09/17

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.

https://activemq.apache.org/security-advisories.data/CVE-2026-39304-announcement.txt