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Vulnerability Instance

Lookup for vulnerabilities affecting packages.

Vulnerability_idVCID-cm77-qbk4-63ff
Summary
Apache ActiveMQ: Denial of Service via Out of Memory vulnerability
Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ.

ActiveMQ NIO SSL transports do not correctly handle TLSv1.3 handshake KeyUpdates triggered by clients. This makes it possible for a client to rapidly trigger updates which causes the broker to exhaust all its memory in the SSL engine leading to DoS.

Note: TLS versions before TLSv1.3 (such as TLSv1.2) are broken but are not vulnerable to OOM. Previous TLS versions require a full handshake renegotiation which causes a connection to hang but not OOM. This is fixed as well.
This issue affects Apache ActiveMQ Client: before 5.19.4, from 6.0.0 before 6.2.4; Apache ActiveMQ Broker: before 5.19.4, from 6.0.0 before 6.2.4; Apache ActiveMQ: before 5.19.4, from 6.0.0 before 6.2.4.

Users are recommended to upgrade to version 6.2.4 or 5.19.5, which fixes the issue.
Aliases
0
alias CVE-2026-39304
1
alias GHSA-5568-6qcg-g7fx
Fixed_packages
0
url pkg:maven/org.apache.activemq/activemq-all@5.19.4
purl pkg:maven/org.apache.activemq/activemq-all@5.19.4
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/activemq-all@5.19.4
1
url pkg:maven/org.apache.activemq/activemq-all@6.2.4
purl pkg:maven/org.apache.activemq/activemq-all@6.2.4
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/activemq-all@6.2.4
2
url pkg:maven/org.apache.activemq/activemq-broker@5.19.4
purl pkg:maven/org.apache.activemq/activemq-broker@5.19.4
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/activemq-broker@5.19.4
3
url pkg:maven/org.apache.activemq/activemq-broker@6.2.4
purl pkg:maven/org.apache.activemq/activemq-broker@6.2.4
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/activemq-broker@6.2.4
4
url pkg:maven/org.apache.activemq/activemq-client@5.19.4
purl pkg:maven/org.apache.activemq/activemq-client@5.19.4
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/activemq-client@5.19.4
5
url pkg:maven/org.apache.activemq/activemq-client@6.2.4
purl pkg:maven/org.apache.activemq/activemq-client@6.2.4
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/activemq-client@6.2.4
6
url pkg:maven/org.apache.activemq/apache-activemq@5.19.4
purl pkg:maven/org.apache.activemq/apache-activemq@5.19.4
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/apache-activemq@5.19.4
7
url pkg:maven/org.apache.activemq/apache-activemq@6.2.4
purl pkg:maven/org.apache.activemq/apache-activemq@6.2.4
is_vulnerable false
affected_by_vulnerabilities
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/apache-activemq@6.2.4
Affected_packages
0
url pkg:maven/org.apache.activemq/activemq-all@6.0.0
purl pkg:maven/org.apache.activemq/activemq-all@6.0.0
is_vulnerable true
affected_by_vulnerabilities
0
vulnerability VCID-bktu-qch2-5ugv
1
vulnerability VCID-ckcj-176v-6fcy
2
vulnerability VCID-cm77-qbk4-63ff
3
vulnerability VCID-qpr5-vxte-dqea
4
vulnerability VCID-tyaw-6dpw-mudm
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/activemq-all@6.0.0
1
url pkg:maven/org.apache.activemq/activemq-broker@6.0.0
purl pkg:maven/org.apache.activemq/activemq-broker@6.0.0
is_vulnerable true
affected_by_vulnerabilities
0
vulnerability VCID-ckcj-176v-6fcy
1
vulnerability VCID-cm77-qbk4-63ff
2
vulnerability VCID-qpr5-vxte-dqea
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/activemq-broker@6.0.0
2
url pkg:maven/org.apache.activemq/activemq-client@6.0.0
purl pkg:maven/org.apache.activemq/activemq-client@6.0.0
is_vulnerable true
affected_by_vulnerabilities
0
vulnerability VCID-cm77-qbk4-63ff
1
vulnerability VCID-q6zs-spcv-v7ey
2
vulnerability VCID-qpr5-vxte-dqea
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/activemq-client@6.0.0
3
url pkg:maven/org.apache.activemq/apache-activemq@6.0.0
purl pkg:maven/org.apache.activemq/apache-activemq@6.0.0
is_vulnerable true
affected_by_vulnerabilities
0
vulnerability VCID-bktu-qch2-5ugv
1
vulnerability VCID-cm77-qbk4-63ff
2
vulnerability VCID-tyaw-6dpw-mudm
3
vulnerability VCID-wema-7dnk-bkhy
resource_url http://public2.vulnerablecode.io/packages/pkg:maven/org.apache.activemq/apache-activemq@6.0.0
References
0
reference_url https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-39304.json
reference_id
reference_type
scores
0
value 7.5
scoring_system cvssv3
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
url https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-39304.json
1
reference_url https://activemq.apache.org/security-advisories.data/CVE-2026-39304-announcement.txt
reference_id
reference_type
scores
0
value 7.5
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1
value HIGH
scoring_system generic_textual
scoring_elements
2
value Track
scoring_system ssvc
scoring_elements SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-10T14:10:10Z/
url https://activemq.apache.org/security-advisories.data/CVE-2026-39304-announcement.txt
2
reference_url https://api.first.org/data/v1/epss?cve=CVE-2026-39304
reference_id
reference_type
scores
0
value 0.00017
scoring_system epss
scoring_elements 0.04079
published_at 2026-04-21T12:55:00Z
1
value 0.0004
scoring_system epss
scoring_elements 0.12089
published_at 2026-04-13T12:55:00Z
2
value 0.0004
scoring_system epss
scoring_elements 0.12121
published_at 2026-04-12T12:55:00Z
3
value 0.0004
scoring_system epss
scoring_elements 0.12158
published_at 2026-04-11T12:55:00Z
4
value 0.00052
scoring_system epss
scoring_elements 0.16313
published_at 2026-04-18T12:55:00Z
5
value 0.00052
scoring_system epss
scoring_elements 0.16292
published_at 2026-04-16T12:55:00Z
url https://api.first.org/data/v1/epss?cve=CVE-2026-39304
3
reference_url https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-39304
reference_id
reference_type
scores
url https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-39304
4
reference_url https://github.com/apache/activemq
reference_id
reference_type
scores
0
value 7.5
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1
value HIGH
scoring_system generic_textual
scoring_elements
url https://github.com/apache/activemq
5
reference_url https://nvd.nist.gov/vuln/detail/CVE-2026-39304
reference_id
reference_type
scores
0
value 7.5
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1
value HIGH
scoring_system generic_textual
scoring_elements
url https://nvd.nist.gov/vuln/detail/CVE-2026-39304
6
reference_url http://www.openwall.com/lists/oss-security/2026/04/09/17
reference_id
reference_type
scores
0
value 7.5
scoring_system cvssv3.1
scoring_elements CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1
value HIGH
scoring_system generic_textual
scoring_elements
url http://www.openwall.com/lists/oss-security/2026/04/09/17
7
reference_url https://bugzilla.redhat.com/show_bug.cgi?id=2457275
reference_id 2457275
reference_type
scores
url https://bugzilla.redhat.com/show_bug.cgi?id=2457275
8
reference_url https://github.com/advisories/GHSA-5568-6qcg-g7fx
reference_id GHSA-5568-6qcg-g7fx
reference_type
scores
0
value HIGH
scoring_system cvssv3.1_qr
scoring_elements
url https://github.com/advisories/GHSA-5568-6qcg-g7fx
Weaknesses
0
cwe_id 400
name Uncontrolled Resource Consumption
description The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
1
cwe_id 770
name Allocation of Resources Without Limits or Throttling
description The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Exploits
Severity_range_score7.0 - 8.9
Exploitability0.5
Weighted_severity8.0
Risk_score4.0
Resource_urlhttp://public2.vulnerablecode.io/vulnerabilities/VCID-cm77-qbk4-63ff