CVE-2026-50734

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0	Vendor Advisory Mailing List
http://www.openwall.com/lists/oss-security/2026/06/29/10	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:apache:activemq::::::::
	cpe:2.3:a:apache:activemq::::::::

History

02 Jul 2026, 18:40

Type	Values Removed	Values Added
CPE		cpe:2.3:a:apache:activemq::::::::
References	~~() https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0 -~~	() https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0 - Vendor Advisory, Mailing List
References	~~() http://www.openwall.com/lists/oss-security/2026/06/29/10 -~~	() http://www.openwall.com/lists/oss-security/2026/06/29/10 - Third Party Advisory
First Time		Apache activemq Apache

30 Jun 2026, 13:19

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5

30 Jun 2026, 12:16

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/06/29/10 -

30 Jun 2026, 11:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-30 11:16

Updated : 2026-07-02 18:40

NVD link : CVE-2026-50734

Mitre link : CVE-2026-50734

CVE.ORG link : CVE-2026-50734

JSON object : View

Products Affected

apache

activemq

CWE

CWE-789

Memory Allocation with Excessive Size Value

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