What is CVE-2026-108949?

CVE-2026-108949 is a medium-severity vulnerability in Apache Software Foundation Activemq Broker, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2026-11-04.

How severe is CVE-2026-108949?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Apache Software Foundation Activemq Broker

CVE-2026-108949

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.

Published 2026-11-04 · last modified 2026-11-04.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

lists.apache.org/thread/2l1jbc8j88w1n9bd44vm9bjtj9t3o80n (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-108949?: CVE-2026-108949 is a medium-severity vulnerability in Apache Software Foundation Activemq Broker, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2026-11-04.
How severe is CVE-2026-108949?: Medium severity. CVSS v3 base score is 6.5 out of 10.