CVE-2026-108949: Apache ActiveMQ, ActiveMQ Broker · Denial of Service via OOM Vulnerability
Source GCVE Database
Not known to be exploited : upgrade to 6.3.3 or 5.19.12 soon.
Data as of 4 Nov 2026, 15:29 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in 6.3.3, 5.19.12
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.
What to do
Upgrade Apache ActiveMQ and ActiveMQ Broker and org.apache.activemq/activemq-broker to 6.3.3 or 5.19.12.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Apache ActiveMQorg.apache.activemq:activemq-broker | Affected
| Fixed in
|
| Apache ActiveMQorg.apache.activemq:activemq-broker | Affected
| Fixed in
|
| ActiveMQ Brokerorg.apache.activemq:activemq-broker | Affected
| Fixed in
|
| ActiveMQ Brokerorg.apache.activemq:activemq-broker | Affected
| Fixed in
|
Mavenorg.apache.activemq/activemq-brokerpkg:maven/org.apache.activemq/activemq-brokerOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Users should upgrade Apache ActiveMQ Broker to versions 6.4.0, 6.3.3, or 5.19.12, which include fixes for this vulnerability. No other mitigations are indicated.
Description
A denial of service vulnerability exists in Apache ActiveMQ Broker where an authenticated OpenWire client can cause an out-of-memory condition by repeatedly sending a ConsumerInfo for a temporary queue or topic owned by another connection. The broker rejects the request but fails to clean up the rejected subscription, leading to heap memory leakage until the broker runs out of memory. This affects Apache ActiveMQ versions from 6.0.0 before 6.3.3 and before 5.19.12. Upgrading to versions 6.4.0, 6.3.3, or 5.19.12 resolves the issue.