Apache ActiveMQ, ActiveMQ Broker: Repeated rejected temporary destination consumer requests can lead to broker OOM
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 6.3.3, 5.19.12
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 6.3.3, 5.19.12.
- Exploitation0/40No signal
- Exposure3/25Reachable over the network · Data gap: No advisory context yet
- Reach10/20Affects Maven packages
- Severity6.5/10CVSS 6.5
- No patch0/5No signal
What would change the score
- Would score about 75 if added to CISA KEV
- Would score about 70 if CISA's SSVC rates exploitation active
- Would score about 39 if advisories confirm default setups are exposed
CVE-2026-108949 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.5 (medium) and affects Apache ActiveMQ and ActiveMQ Broker; fixed in 6.3.3 and 5.19.12.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 20/100 · provisional
- Fix
- Fixed in 6.3.3, 5.19.12
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
Apache ActiveMQ and ActiveMQ Broker can be crashed through a denial-of-service flaw: an authenticated OpenWire client that repeatedly sends consumer requests for temporary destinations owned by other connections causes the broker to leak heap memory until it runs out of memory. The leak happens because rejected subscriptions are never cleaned up.
Read the original 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.
Impact
- Widely used
68 packages depend on org.apache.activemq:activemq-broker.Source: deps.dev
What to do
Upgrade to a fixed version: 6.3.3, 5.19.12.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- org.apache.activemq:activemq-brokerMaven
From 6.0.0 · fixed in 6.3.3; fixed in 5.19.12
- org.apache.activemq:activemq-brokerMaven
From 6.0.0 · fixed in 6.3.3; fixed in 5.19.12
Evidence 2
- Advisory
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-108949
Is CVE-2026-108949 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-108949?
org.apache.activemq:activemq-broker (Maven): from 6.0.0 before 6.3.3; before 5.19.12. org.apache.activemq:activemq-broker (Maven): from 6.0.0 before 6.3.3; before 5.19.12.Source: cve.now feed data
How do I fix CVE-2026-108949?
Upgrade to a fixed version: 6.3.3, 5.19.12.Source: cve.now feed data