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CVE-2026-39304 Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ

Description

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.

Affected products and versions

Product Affected versions Fixed in
Apache ActiveMQ Client 6.0 6.0.0 → < 6.2.4 6.2.4
Apache ActiveMQ Client 5.19 earliest → < 5.19.4 5.19.4
Apache ActiveMQ Broker 6.0 6.0.0 → < 6.2.4 6.2.4
Apache ActiveMQ Broker 5.19 earliest → < 5.19.4 5.19.4
Apache ActiveMQ All 6.0 6.0.0 → < 6.2.4 6.2.4
Apache ActiveMQ All 5.19 earliest → < 5.19.4 5.19.4
Apache ActiveMQ 6.0 6.0.0 → < 6.2.4 6.2.4
Apache ActiveMQ 5.19 earliest → < 5.19.4 5.19.4
Red Hat Fuse 7 Versions not published
Show the 8 other branches
Product Affected versions Fixed in
Red Hat AMQ Broker 7 Versions not published
Red Hat build of Apache Camel for Spring Boot 4 Versions not published
Red Hat Data Grid 8 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat JBoss Enterprise Application Platform 7 Versions not published
Red Hat JBoss Enterprise Application Platform 8 Versions not published
Red Hat JBoss Enterprise Application Platform Expansion Pack Versions not published

References

Timeline

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