High severity · published Jun 30, 2026
CVE-2026-50750
Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire DoS following fix for CVE-2026-49270
7.5
CVSS
0.7%
EPSS
No
On KEV
Description
Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All.
Following the fix for CVE-2026-49270 an unauthenticated attacker can now cause broker OOM by sending an repeated BrokerInfo commands without sending a ConnectionInfo, until the broker will crash with OOM.
This issue affects Apache ActiveMQ Broker: from 5.19.7 before 5.19.8, from 6.2.6 before 6.2.7; Apache ActiveMQ: from 5.19.7 before 5.19.8, from 6.2.6 before 6.2.7; Apache ActiveMQ All: from 5.19.7 before 5.19.8, from 6.2.6 before 6.2.7.
Users are recommended to upgrade to version 6.2.7, which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
ActiveMQ · Apache
5.19.7 before 5.19.8; 6.2.6 before 6.2.7 · source: vendor, NVD
AA
Apache ActiveMQ All · Apache Software Foundation
5.19.7 before 5.19.8; 6.2.6 before 6.2.7 · source: vendor
AA
Apache ActiveMQ Broker · Apache Software Foundation
5.19.7 before 5.19.8; 6.2.6 before 6.2.7 · source: vendor
AB
Activemq Broker · Apache
5.19.7; 6.2.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50750
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-50750
Vendor Advisory
https://lists.apache.org/thread/nhkmbdym61yp6wwy0dny8w1p46sm87kr
More from ActiveMQ
9.8
CVE-2023-46604
Apache ActiveMQ, Apache ActiveMQ Legacy OpenWire Module: Unbounded deserialization causes ActiveMQ to be vulnerable to a remote code execution (RCE) attack
9.8
CVE-2016-3088
The Fileserver web application in Apache ActiveMQ 5.x before 5.14.0 allows remote attackers to upload and execute arbitrary files via an HTTP PUT followed by an HTTP MOVE request
8.8
CVE-2026-34197
Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Authenticated users could perform RCE via Jolokia MBeans
9.9
CVE-2021-21345
XStream is vulnerable to a Remote Command Execution attack
9.8
CVE-2021-21350
XStream is vulnerable to an Arbitrary Code Execution attack