Vulnerability-Lookup

CVE-2026-39304 (GCVE-0-2026-39304)

Vulnerability from cvelistv5 – Published: 2026-04-10 10:54 – Updated: 2026-04-10 14:10

Title

Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Incorrect handling of TLSv1.3 KeyUpdate can be exploited to cause DoS via OOM

Summary

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.

Severity ?

No CVSS data available.

CWE

Denial of Service via Out of Memory

Assigner

apache

References

URL

Tags

https://activemq.apache.org/security-advisories.d…

vendor-advisory

Impacted products

Vendor

Product

Version

Apache Software Foundation

Apache ActiveMQ Client

Affected: 0 , < 5.19.4 (semver)
Affected: 6.0.0 , < 6.2.4 (semver)

Apache Software Foundation	Apache ActiveMQ Broker	Affected: 0 , < 5.19.4 (semver) Affected: 6.0.0 , < 6.2.4 (semver)
Apache Software Foundation	Apache ActiveMQ All	Affected: 0 , < 5.19.4 (semver) Affected: 6.0.0 , < 6.2.4 (semver)
Apache Software Foundation	Apache ActiveMQ	Affected: 0 , < 5.19.4 (semver) Affected: 6.0.0 , < 6.2.4 (semver)

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-39304

Vulnerability from fkie_nvd - Published: 2026-04-10 11:16 - Updated: 2026-04-10 11:16

Severity ?

Summary

References

	URL	Tags
	security@apache.org	https://activemq.apache.org/security-advisories.data/CVE-2026-39304-announcement.txt

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-5568-6QCG-G7FX

Vulnerability from github – Published: 2026-04-10 12:31 – Updated: 2026-04-10 21:01

Summary

Apache ActiveMQ: Denial of Service via Out of Memory vulnerability

Details

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.

Severity ?

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

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    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:apache-activemq"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.19.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.activemq:apache-activemq"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-39304"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-10T21:01:01Z",
    "nvd_published_at": "2026-04-10T11:16:23Z",
    "severity": "HIGH"
  },
  "details": "Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ.\n\nActiveMQ 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.\n\nNote: 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.\nThis 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.\n\nUsers are recommended to upgrade to version 6.2.4 or 5.19.5, which fixes the issue.",
  "id": "GHSA-5568-6qcg-g7fx",
  "modified": "2026-04-10T21:01:01Z",
  "published": "2026-04-10T12:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39304"
    },
    {
      "type": "WEB",
      "url": "https://activemq.apache.org/security-advisories.data/CVE-2026-39304-announcement.txt"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/activemq"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/04/09/17"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": " Apache ActiveMQ: Denial of Service via Out of Memory vulnerability"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-39304 (GCVE-0-2026-39304)

FKIE_CVE-2026-39304

GHSA-5568-6QCG-G7FX

Tags

Sightings

Nomenclature