Apache ActiveMQ up to 5.19.7/6.2.6 OpenWire denial of service

Summaryinfo

A vulnerability labeled as problematic has been found in Apache ActiveMQ up to 5.19.7/6.2.6. The affected element is an unknown function of the component OpenWire. Executing a manipulation can lead to denial of service. This vulnerability is handled as CVE-2026-50734. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Apache ActiveMQ up to 5.19.7/6.2.6. It has been declared as problematic. This vulnerability affects an unknown part of the component OpenWire. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All. An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker. This issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7. Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.

The advisory is shared for download at lists.apache.org. This vulnerability was named CVE-2026-50734. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/04/2026). The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 5.19.8 or 6.2.7 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-40282). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Application Server Software

Vendor

• Apache

Name

• ActiveMQ

Version

• 5.19.0
• 5.19.1
• 5.19.2
• 5.19.3
• 5.19.4
• 5.19.5
• 5.19.6
• 5.19.7
• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6

License

• open-source

Website

• Vendor: https://www.apache.org/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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