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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache ActiveMQ Client | < 5.19.4, 6.0.0 – < 6.2.4 | 5.19.4 |
| Apache Software Foundation | Apache ActiveMQ Broker | < 5.19.4, 6.0.0 – < 6.2.4 | 5.19.4 |
| Apache Software Foundation | Apache ActiveMQ All | < 5.19.4, 6.0.0 – < 6.2.4 | 5.19.4 |
| Apache Software Foundation | Apache ActiveMQ | < 5.19.4, 6.0.0 – < 6.2.4 | 5.19.4 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | activemq | No fix yet | — |
| Debian 12 | activemq | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | activemq | No fix yet | — |
| Ubuntu 26.04 LTS | activemq | No fix yet | — |
| Ubuntu 25.10 | activemq | No fix yet | — |
| Ubuntu 24.04 LTS | activemq | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | activemq | No fix yet | — |
| Ubuntu Pro 20.04 LTS | activemq | No fix yet | — |
| Ubuntu Pro 18.04 LTS | activemq | No fix yet | — |
| Ubuntu Pro 16.04 LTS | activemq | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | apache-activemq-artemis | 2.53.0-r5 | — |
| Wolfi rolling | zipkin | 3.6.1-r3 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.activemq:activemq-all | < 5.19.4 | 5.19.4 | GHSA-5568-6qcg-g7fx |
| Maven | org.apache.activemq:activemq-all | >= 6.0.0, < 6.2.4 | 6.2.4 | GHSA-5568-6qcg-g7fx |
| Maven | org.apache.activemq:activemq-broker | < 5.19.4 | 5.19.4 | GHSA-5568-6qcg-g7fx |
| Maven | org.apache.activemq:activemq-broker | >= 6.0.0, < 6.2.4 | 6.2.4 | GHSA-5568-6qcg-g7fx |
| Maven | org.apache.activemq:activemq-client | < 5.19.4 | 5.19.4 | GHSA-5568-6qcg-g7fx |
| Maven | org.apache.activemq:activemq-client | >= 6.0.0, < 6.2.4 | 6.2.4 | GHSA-5568-6qcg-g7fx |
| Maven | org.apache.activemq:apache-activemq | < 5.19.4 | 5.19.4 | GHSA-5568-6qcg-g7fx |
| Maven | org.apache.activemq:apache-activemq | >= 6.0.0, < 6.2.4 | 6.2.4 | GHSA-5568-6qcg-g7fx |
Advisories 3
- WID-SEC-2026-3043 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- WID-SEC-2026-1040 Apache ActiveMQ: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 23, 2026
- WID-SEC-2026-1608 Atlassian Produkte (Bamboo, Bitbucket, Confluence, Crucible, Fisheye und Jira): Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 19, 2026