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CVE-2026-50734

Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire memory-allocation DoS during wire format negotiation

Published: Jun 30, 2026Updated: Jul 2, 2026 Sources: CVE List NVDCWE-789
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 57.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-789

Affected Products

Apache Software Foundation
oss-project·USaka apache foundation
Apache ActiveMQ ClientLibraryLibrary
OSS Libraries / generic-library
Apache ActiveMQ
Databases / cache-message-queue
Apache ActiveMQ AllLibraryLibrary
OSS Libraries / generic-library
apache
oss-project·USaka apache httpd, apache http server
activemqLibraryLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
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References

https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0
lists.apache.org
http://www.openwall.com/lists/oss-security/2026/06/29/10
openwall.com

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