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VulnerabilityPublished

CVE-2026-108949: Apache ActiveMQ · Memory Leak

Affects Apache ActiveMQSource CVE Database V5

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Not known to be exploited : upgrade to 6.3.3 or 5.19.12 soon.

Data as of 4 Nov 2026, 11:13 UTC

Severity
High

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

  1. Disclosed: evidence found.

    CVE published 4 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Apache ActiveMQorg.apache.activemq:activemq-brokerAffected
  • >=6.0.0 <6.3.3
Fixed in
  • 6.3.3
Apache ActiveMQorg.apache.activemq:activemq-brokerAffected
  • <5.19.12
Fixed in
  • 5.19.12
ActiveMQ Brokerorg.apache.activemq:activemq-brokerAffected
  • >=6.0.0 <6.3.3
Fixed in
  • 6.3.3
ActiveMQ Brokerorg.apache.activemq:activemq-brokerAffected
  • <5.19.12
Fixed in
  • 5.19.12
Mavenorg.apache.activemq/activemq-brokerpkg:maven/org.apache.activemq/activemq-brokerOther threatsAffected
  • >=6.0.0 <6.3.3
  • <5.19.12
Fixed in
  • 6.3.3
  • 5.19.12

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 and ActiveMQ Broker to versions 6.3.3, 5.19.12, or later, where this memory leak issue is fixed. No other mitigation or workaround is indicated.

Description

CVE-2026-108949 is a memory leak vulnerability in Apache ActiveMQ and ActiveMQ Broker that can lead to denial of service via out-of-memory (OOM) conditions. An authenticated OpenWire client sending a ConsumerInfo for a temporary queue/topic owned by another connection causes the broker to reject the request but leaves behind rejected subscriptions in memory. Repeated exploitation causes heap exhaustion. The issue affects Apache ActiveMQ versions from 6.0.0 before 6.3.3 and versions before 5.19.12. Fixed versions are 6.3.3 and 5.19.12.

References

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