CVE-2026-39304

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://activemq.apache.org/security-advisories.data/CVE-2026-39304-announcement.txt	Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/09/17	Mailing List Third Party Advisory
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

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:apache:activemq::::::::
	cpe:2.3:a:apache:activemq::::::::
	cpe:2.3:a:apache:activemq_broker::::::::
	cpe:2.3:a:apache:activemq_broker::::::::

History

No history.

Information

Published : 2026-04-10 11:16

Updated : 2026-07-15 02:20

NVD link : CVE-2026-39304

Mitre link : CVE-2026-39304

CVE.ORG link : CVE-2026-39304

JSON object : View

Products Affected

apache

activemq
activemq_broker

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-770

Allocation of Resources Without Limits or Throttling

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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."}], "lastModified": "2026-07-15T02:20:45.360", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "83EF7DD6-C3A9-4561-ADC0-1E6ED5429307", "versionEndExcluding": "5.19.4"}, {"criteria": "cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4BAE411E-AC4C-4BC7-88F0-06A57D2768DD", "versionEndExcluding": "6.2.4", "versionStartIncluding": "6.0.0"}, {"criteria": "cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "ECEF15DD-10E8-40A4-897B-3DA7F12E2C07", "versionEndExcluding": "5.19.4"}, {"criteria": "cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2C299CB9-FEA4-4CC5-B3A5-D1170BE63560", "versionEndExcluding": "6.2.4", "versionStartIncluding": "6.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@apache.org"}