CVE-2026-39304
Full vulnerability record from the local CVENow database.
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.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-04-10 11:16:23.143000
Last modified
2026-10-26 21:10:00.170000
View original CVE JSON
{
"id": "CVE-2026-39304",
"sourceIdentifier": "[email protected]",
"published": "2026-04-10T11:16:23.143",
"lastModified": "2026-10-26T21:10:00.170",
"vulnStatus": "Modified",
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"value": "Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ.\n\nActiveMQ 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.\n\nNote: 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.\nThis 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.\n\nUsers are recommended to upgrade to version 6.2.4 or 5.19.5, which fixes the issue."
},
{
"lang": "es",
"value": "Denegación de servicio a través de una vulnerabilidad de falta de memoria en Apache ActiveMQ Cliente, Apache ActiveMQ Broker, Apache ActiveMQ.\n\nLos transportes SSL NIO de ActiveMQ no manejan correctamente las actualizaciones de clave de handshake de TLSv1.3 activadas por clientes. Esto hace posible que un cliente active rápidamente actualizaciones, lo que provoca que el broker agote toda su memoria en el motor SSL, lo que lleva a DoS.\n\nNota: Las versiones de TLS anteriores a TLSv1.3 (como TLSv1.2) están rotas pero no son vulnerables a OOM. Las versiones anteriores de TLS requieren una renegociación completa del handshake, lo que provoca que una conexión se cuelgue pero no OOM. Esto también está solucionado.\nEste problema afecta a Apache ActiveMQ Cliente: antes de 5.19.4, desde 6.0.0 antes de 6.2.4; Apache ActiveMQ Broker: antes de 5.19.4, desde 6.0.0 antes de 6.2.4; Apache ActiveMQ: antes de 5.19.4, desde 6.0.0 antes de 6.2.4.\n\nSe recomienda a los usuarios que actualicen a la versión 6.2.4 o 5.19.5, lo que soluciona el problema."
}
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