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Fencer Vulns
high 7.5

CVE-2026-50734 json

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

published 2026-06-30 4 mo ago modified 2026-11-04 5 d ago also BIT-activemq-2026-50734 , EUVD-2026-40282 , GHSA-7259-vf48-52q3

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.apache.activemq:activemq-client 5.19.8, 6.2.7
  • maven org.apache.activemq:apache-activemq 5.19.8, 6.2.7
  • maven org.apache.activemq:activemq-all 5.19.8, 6.2.7
  • bitnami activemq 5.19.8, 6.2.7
  • Apache Software Foundation Apache ActiveMQ Client 5.19.8, 6.2.7
  • Apache Software Foundation Apache ActiveMQ 5.19.8, 6.2.7
  • Apache Software Foundation Apache ActiveMQ All 5.19.8, 6.2.7

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-50734 updated cvss 7.5

Apache ActiveMQ Client: Apache ActiveMQ: Apache ActiveMQ All: Apache ActiveMQ: Denial of Service via crafted WireFormatInfo frame

  • Red Hat AMQ Broker 7 artemis-ra, artemis-cli, artemis-dto, artemis-web, artemis-boot, apache-artemis, +26 more Red Hat AMQ Clients artemis-server, artemis-commons, artemis-journal, artemis-selector, artemis-jdbc-store, artemis-amqp-protocol, +2 more
    affected: workaround, no fix available
  • Red Hat Fuse 7 activeio-core, activemq-http, activemq-mqtt, activemq-osgi, activemq-pool, activemq-karaf, +10 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Single Sign-On 7 artemis-ra, artemis-cli, artemis-dto, artemis-tools, artemis-server, artemis-commons, +14 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat AMQ Clients 2026.Q3
    fixed: vendor fix RHSA-2026:69459
  • Red Hat AMQ Broker 7.13.6
    fixed: vendor fix RHSA-2026:66545
  • Red Hat AMQ Broker 7.14.1
    fixed: vendor fix RHSA-2026:66488
  • Red Hat build of Apache Camel for Spring Boot 4 artemis-mqtt-protocol, activemq-artemis-native, artemis-relocations-parent, libartemis-native-linux-i686, libartemis-native-linux-s390x, libartemis-native-linux-x86_64, +2 more
    not affected: vulnerable code not in execute path
  • Red Hat Data Grid 8 zipkin-sender-activemq-client
    not affected: component not present
show 2 more
  • Red Hat Enterprise Linux 8 log4j, log4j-jcl, log4j-web, log4j-slf4j Red Hat JBoss Enterprise Application Platform 7 wildfly-messaging-activemq Red Hat JBoss Enterprise Application Platform 8 artemis-cli, artemis-dto, artemis-server, artemis-commons, artemis-journal, artemis-selector, +17 more
    not affected: vulnerable code not present
  • Red Hat Satellite 6 candlepin, candlepin-selinux
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.activemq:activemq-client
<5.19.8
>=6.0.0, <6.2.7
5.19.8
6.2.7
maven org.apache.activemq:apache-activemq
<5.19.8
>=6.0.0, <6.2.7
5.19.8
6.2.7
maven org.apache.activemq:activemq-all
<5.19.8
>=6.0.0, <6.2.7
5.19.8
6.2.7
bitnami activemq
<5.19.8
>=6.0.0, <6.2.7
5.19.8
6.2.7

Affected products

  • Apache Software Foundation Apache ActiveMQ Client
  • Apache Software Foundation Apache ActiveMQ
  • Apache Software Foundation Apache ActiveMQ All

Classification

Weakness
  • CWE-789 Memory Allocation with Excessive Size Value

References

Sources

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