CVE-2026-108949: Apache ActiveMQ, ActiveMQ Broker: Repeated rejected temporary destination consumer requests can lead to broker OOM
CVE-2026-108949 key facts
- CISA KEV
- Not listed (catalogue checked )
- Highest advisory rating
- Medium
- CVSS base score
- 6.5 (Apache), 6.5 (Red Hat)
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H· base score 6.5, scored by CISA-ADPAttack vector: network. Attack complexity: low. Privileges required: low. User interaction: none. Scope: unchanged. Confidentiality impact: none. Integrity impact: none. Availability impact: high.- Weakness
- CWE-401 Missing release of memory after effective lifetime
- CISA SSVC
- Exploitation: none observed. Automatable: no. Technical impact: partial. CISA, .
- Fixed releases
- Apache: 6.3.3, 5.19.12
- Red Hat: 6.4.0, 6.3.3, 5.19.12
- Assigned by
- apache (CNA)
- CVE record published
- Listed by VulniPulse
- Record changed
Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-108949; each belongs to its advisory, not to every product listed. How records are collected and checked.
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.
Text from the CVE.org record (apache).
How do I fix CVE-2026-108949?
Upgrade to a fixed release named by the vendor:
- Apache: 6.3.3, 5.19.12
- Red Hat: 6.4.0, 6.3.3, 5.19.12
- Users are recommended to upgrade to version 6.4.0, 6.3.3, or 5.19.12, which fixes the issue. (Apache)
- Upgrade to fixed versions (activemq-broker 6.4.0, 6.3.3, or 5.19.12); restrict broker authentication and monitor broker heap. (Red Hat)
Vendor advisories for CVE-2026-108949
Apache
1 advisory- Advisory severityMedium6.5
Medium [CVE-2026-108949] Apache ActiveMQ, ActiveMQ Broker: Repeated rejected temporary destination consumer requests can lead to broker OOM
CVE-2026-108949Source published Source updated
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 products in this advisory
- Apache ActiveMQ
- Source-reported affected versions
- Apache ActiveMQ 6.0.0 before 6.3.3
- Apache ActiveMQ before 5.19.12
- ActiveMQ Broker 6.0.0 before 6.3.3
- ActiveMQ Broker before 5.19.12
- Source-reported fixed versions
- 6.3.3
- 5.19.12
- Mitigation guidance
- Users are recommended to upgrade to version 6.4.0, 6.3.3, or 5.19.12, which fixes the issue.
Red Hat
1 advisory- Advisory severityMedium6.5
Medium [CVE-2026-108949] Denial of Service via memory leak from rejected subscriptions
CVE-2026-108949Source published Source updated
Denial of Service via memory leak from rejected subscriptions. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-772. Affected product named by the advisory: Red Hat Fuse 7.
- Related products — impact not confirmed
- Red Hat Fuse 7
- Source-reported affected versions
- < 6.0.0
- < 6.3.3
- < 5.19.12
- Source-reported fixed versions
- 6.4.0
- 6.3.3
- 5.19.12
- Mitigation guidance
- Upgrade to fixed versions (activemq-broker 6.4.0, 6.3.3, or 5.19.12); restrict broker authentication and monitor broker heap.
References
- CVE-2026-108949 recordCVE.org
- CVE-2026-108949 detailNVD
- lists.apache.org/thread/2l1jbc8j88w1n9bd44vm9bjtj9t3o80nvendor-advisory
Timeline
- CVE record published
- First vendor advisory listed by VulniPulse
- CVE record last updated
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