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CVE-2026-33227: Improper validation and restriction of a classpath path name vulnerability in Apache ActiveMQ Client, Apach

29
Routine
MEDIUM 4.3WATCHLISTUPGRADEUPGRADEUPGRADE

CVE-2026-33227 is a medium-severity flaw (CVSS 4.3) affecting activemq, activemq broker, activemq web. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper validation and restriction of a classpath path name vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ Web, Apache ActiveMQ. In two instances (when creating a Stomp consumer and also browsing messages in the Web console) an authenticated user provided "key" value could be constructed to traverse the classpath due to path concatenation. As a result, the application is exposed to a c

Why this priority

  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score4.3 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.4% (top 64%)
CISA exploited listNo
WeaknessCWE-22
Published2026-04-07
Last modified2026-10-26
Publisher (CNA): Apache Software Foundation · Vendor: apache

Share: LinkedIn · X · Reddit

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

apache activemq UPGRADE
Affected: < 5.19.3 · >= 6.0.0 and < 6.2.2
Fixed in: 5.19.3, 6.2.2
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 5.19.3 (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: < 5.19.3 · >= 6.0.0 and < 6.2.2
Fixed in: 5.19.3, 6.2.2
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 5.19.3 (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.
apache activemq web UPGRADE
Affected: < 5.19.3 · >= 6.0.0 and < 6.2.2
Fixed in: 5.19.3, 6.2.2
Safe to downgrade to: a release before 6.0.0
1. Check installed version
apt-cache policy activemq-web || rpm -q activemq-web || activemq-web --version
2. UPGRADE to 5.19.3 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade activemq-web
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade activemq-web
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-web sudo apt install activemq-web=<VERSION_BEFORE_6.0.0> sudo apt-mark hold activemq-web
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list activemq-web sudo dnf downgrade activemq-web-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add activemq-web
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-2026-33227?

activemq: upgrade to 5.19.3, 6.2.2; activemq broker: upgrade to 5.19.3, 6.2.2; activemq web: upgrade to 5.19.3, 6.2.2. Exact commands for each OS are on this page.

Is CVE-2026-33227 being exploited?

CVE-2026-33227 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-2026-33227 affect?

CVE-2026-33227 affects activemq, activemq broker, activemq web. Severity is medium (CVSS 4.3). Improper validation and restriction of a classpath path name vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ Web, Apache ActiveMQ. In two instances (when creating a Stomp consumer

How urgent is CVE-2026-33227?

Priority 29/100. On your watchlist

Software pages

Apache ActiveMQ vulnerabilities

Related CVEs

References

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