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
Summary
| CVE | CVE-2026-39304 |
|---|---|
| State | PUBLISHED |
| Assigner | apache |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-04-10 11:16:23 UTC |
| Updated | 2026-04-10 15:16:25 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.000400000 probability, percentile 0.121580000 (date 2026-04-11)
Problem Types: CWE-400 | Denial of Service via Out of Memory | CWE-400 CWE-400 Uncontrolled Resource Consumption
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Apache Software Foundation | Apache ActiveMQ Client | affected 5.19.4 semver | Not specified |
| CNA | Apache Software Foundation | Apache ActiveMQ Client | affected 6.0.0 6.2.4 semver | Not specified |
| CNA | Apache Software Foundation | Apache ActiveMQ Broker | affected 5.19.4 semver | Not specified |
| CNA | Apache Software Foundation | Apache ActiveMQ Broker | affected 6.0.0 6.2.4 semver | Not specified |
| CNA | Apache Software Foundation | Apache ActiveMQ All | affected 5.19.4 semver | Not specified |
| CNA | Apache Software Foundation | Apache ActiveMQ All | affected 6.0.0 6.2.4 semver | Not specified |
| CNA | Apache Software Foundation | Apache ActiveMQ | affected 5.19.4 semver | Not specified |
| CNA | Apache Software Foundation | Apache ActiveMQ | affected 6.0.0 6.2.4 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| activemq.apache.org/security-advisories.data/CVE-2026-39304-announcement.txt | [email protected] | activemq.apache.org | |
| www.openwall.com/lists/oss-security/2026/04/09/17 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.