# CVE-2026-108949: Apache ActiveMQ, ActiveMQ Broker: Repeated rejected temporary destination consumer requests can lead to broker OOM

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Apache Software Foundation / Apache ActiveMQ (org.apache.activemq:activemq-broker): ≥ 6.0.0; < 6.3.3 (affected, semver); ≥ 0; < 5.19.12 (affected, semver). Source: CNA: apache
- Apache Software Foundation / ActiveMQ Broker (org.apache.activemq:activemq-broker): ≥ 6.0.0; < 6.3.3 (affected, semver); ≥ 0; < 5.19.12 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: ADP: CISA-ADP

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-401

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://lists.apache.org/thread/2l1jbc8j88w1n9bd44vm9bjtj9t3o80n (CNA: apache; vendor-advisory)

- http://www.openwall.com/lists/oss-security/2026/11/03/18 (ADP: CVE)

- https://lists.apache.org/thread/2l1jbc8j88w1n9bd44vm9bjtj9t3o80n (security@apache.org)

- http://www.openwall.com/lists/oss-security/2026/11/03/18 (af854a3a-2127-422b-91ae-364da2661108)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-108949; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108949; retrieved 2026-11-05; source updated 2026-11-04

Revision: 8ab5ab9b0a0ee44ac1dab630e1c99373e0bf20c0f9e2b39a3a60468692d4370b

Canonical: https://y2.dev/cve/CVE-2026-108949

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