Riskcovery

CVE-2026-39304

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

State
Published
Severity
7.5 High
Published
Apr 10, 2026
Updated
Jul 15, 2026
Reserved
Apr 6, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCISA-ADP
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hredhat-SADP

Weaknesses

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

Affected Products

ProductVersions
Apache ActiveMQ ClientApache Software Foundation
  • before 5.19.4Affected
  • 6.0.0 to before 6.2.4Affected
Apache ActiveMQ BrokerApache Software Foundation
  • before 5.19.4Affected
  • 6.0.0 to before 6.2.4Affected
Apache ActiveMQ AllApache Software Foundation
  • before 5.19.4Affected
  • 6.0.0 to before 6.2.4Affected
Apache ActiveMQApache Software Foundation
  • before 5.19.4Affected
  • 6.0.0 to before 6.2.4Affected

References

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