Vulnerability · Published Nov 4, 2026 · Assigned by apache
CVE-2026-108949Apache ActiveMQ, ActiveMQ Broker: Repeated rejected temporary destination consumer requests can lead to broker OOM
Medium 6.5
In plain English
A medium-severity memory leak in ActiveMQ Broker from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).
Official description
Denial of Service via OOM vulnerability in Apache ActiveMQ, ActiveMQ Broker. An authenticated OpenWire client that sends a ConsumerInfo for a temporary queue/topic owned by another connection is rejected with InvalidDestinationException, but the rejected Subscription is left behind in the region's subscriptions map. Repeating the request leaks broker heap until OOM because the broker does not clean up the rejected subscriptions in the map. This issue affects Apache ActiveMQ: from 6.0.0 before 6.3.3, before 5.19.12; ActiveMQ Broker: from 6.0.0 before 6.3.3, before 5.19.12. Users are recommended to upgrade to version 6.4.0, 6.3.3, or 5.19.12, which fixes the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | activemq | no fix listed | DEBIAN-CVE-2026-108949 |
| Debian:13 | activemq | no fix listed | DEBIAN-CVE-2026-108949 |
| Ubuntu:24.04:LTS | activemq | no fix listed | UBUNTU-CVE-2026-108949 |
| Ubuntu:26.04:LTS | activemq | no fix listed | UBUNTU-CVE-2026-108949 |
| Ubuntu:26.10 | activemq | no fix listed | UBUNTU-CVE-2026-108949 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache ActiveMQ | 6.0.0 – before 6.3.30 – before 5.19.12 |
| Apache Software Foundation | ActiveMQ Broker | 6.0.0 – before 6.3.30 – before 5.19.12 |
Weakness: CWE-401 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H