CVE-2026-42588: Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache A

This month

HIGH 8.1WATCHLISTUPGRADEUPGRADE

CVE-2026-42588 is a high-severity flaw (CVSS 8.1) affecting activemq, activemq broker. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ. Apache ActiveMQ Classic exposes the Jolokia JMX-HTTP bridge at /api/jolokia/ on the web console. The default Jolokia access policy permits exec operations on all ActiveMQ MBeans (org.apache.activemq:*), including BrokerService.addNetworkConnector(String). An authenticated attacker ca

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 46%)
CISA exploited list	No
Weakness	CWE-20, CWE-94
Published	2026-06-01
Last modified	2026-07-22

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-01 09:16 UTCPublished CVE record published
2026-07-22 07:10 UTCUpdated Record last modified

apache activemq UPGRADE

Affected: < 5.19.7 · >= 6.0.0 and < 6.2.6

Fixed in: 5.19.7, 6.2.6

Safe to downgrade to: a release before 6.0.0

1. Check installed version

apt-cache policy activemq || rpm -q activemq || activemq --version

2. UPGRADE to 5.19.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade activemq

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade activemq

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.0.0 (Debian / Ubuntu)

apt-cache madison activemq sudo apt install activemq=<VERSION_BEFORE_6.0.0> sudo apt-mark hold activemq

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list activemq sudo dnf downgrade activemq-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add activemq

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

apache activemq broker UPGRADE

Affected: < 5.19.7 · >= 6.0.0 and < 6.2.6

Fixed in: 5.19.7, 6.2.6

Safe to downgrade to: a release before 6.0.0

1. Check installed version

apt-cache policy activemq-broker || rpm -q activemq-broker || activemq-broker --version

2. UPGRADE to 5.19.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade activemq-broker

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade activemq-broker

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.0.0 (Debian / Ubuntu)

apt-cache madison activemq-broker sudo apt install activemq-broker=<VERSION_BEFORE_6.0.0> sudo apt-mark hold activemq-broker

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list activemq-broker sudo dnf downgrade activemq-broker-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add activemq-broker

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42588?

activemq: upgrade to 5.19.7, 6.2.6; activemq broker: upgrade to 5.19.7, 6.2.6. Exact commands for each OS are on this page.

Is CVE-2026-42588 being exploited?

CVE-2026-42588 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42588 affect?

CVE-2026-42588 affects activemq, activemq broker. Severity is high (CVSS 8.1). Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ. Apache ActiveMQ Classic exposes the Jolokia JMX-HTTP bridge at /api/jolokia

How urgent is CVE-2026-42588?

Priority 47/100. High severity; On your watchlist

Software pages

Apache ActiveMQ vulnerabilities

Related CVEs

CVE-2026-34197 HIGH 8.8 EXPLOITED UPGRADE UPGRADE Apache ActiveMQ Improper Input Validation Vulnerability
CVE-2026-40466 HIGH 8.8 UPGRADE UPGRADE Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache A
CVE-2026-41043 MEDIUM 6.5 UPGRADE UPGRADE Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Apache ActiveMQ
CVE-2026-33227 MEDIUM 4.3 UPGRADE UPGRADE Improper validation and restriction of a classpath path name vulnerability in Apache ActiveMQ Client, Apach
CVE-2026-39304 HIGH 7.5 UPGRADE UPGRADE Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache Ac

References

← Back to latest CVEs