CVE-2026-50734
Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire memory-allocation DoS during wire format negotiation
Description
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.
INFO
Published Date :
June 30, 2026, 11:16 a.m.
Last Modified :
July 2, 2026, 6:40 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade Apache ActiveMQ to version 5.19.8 or later.
- Upgrade Apache ActiveMQ to version 6.2.7 or later.
- Apply vendor-supplied patches for affected components.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-50734.
| URL | 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-50734 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-50734
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-50734 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-50734 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 02, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* versions up to (excluding) 5.19.8 *cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* versions from (including) 6.0.0 up to (excluding) 6.2.7 Added Reference Type Apache Software Foundation: https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0 Types: Mailing List, Vendor Advisory Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/06/29/10 Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 30, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added SSVC {'id': 'CVE-2026-50734', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-30T12:32:21.060414Z'} -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Jun. 30, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/06/29/10 -
New CVE Received by [email protected]
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Apache Software Foundation', 'product': 'Apache ActiveMQ Client', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.19.8', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.0.0', 'lessThan': '6.2.7', 'versionType': 'semver'}], 'packageName': 'org.apache.activemq:activemq-client', 'collectionURL': 'https://repo.maven.apache.org/maven2', 'defaultStatus': 'unaffected'}, {'vendor': 'Apache Software Foundation', 'product': 'Apache ActiveMQ', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.19.8', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.0.0', 'lessThan': '6.2.7', 'versionType': 'semver'}], 'packageName': 'org.apache.activemq:apache-activemq', 'defaultStatus': 'unaffected'}, {'vendor': 'Apache Software Foundation', 'product': 'Apache ActiveMQ All', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '5.19.8', 'versionType': 'semver'}, {'status': 'affected', 'version': '6.0.0', 'lessThan': '6.2.7', 'versionType': 'semver'}], 'packageName': 'org.apache.activemq:activemq-all', 'defaultStatus': 'unaffected'}] Added Description 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. Added CWE CWE-789 Added Reference https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0