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CVE-2026-59878: Improper Input Validation vulnerability in Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All. A remo

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HIGH 7.5REMOTEWATCHLISTUPGRADEUPGRADEUPGRADE

CVE-2026-59878 is a high-severity flaw (CVSS 7.5) affecting activemq, activemq all, activemq amqp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Input Validation vulnerability in Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All. A remote unauthenticated peer that can reach an exposed AMQP NIO connector can trigger denial-of-service behavior by sending a frame size value. This cause the NIO threads to die and if done rapidly enough can lead to exhaustion of the NIO thread pool denying service to other connections. This issue affects Apache ActiveMQ AMQP: before 5.19.9,

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.8% (top 44%)
CISA exploited listNo
WeaknessCWE-20
Published2026-07-28
Last modified2026-08-05
Publisher (CNA): Apache Software Foundation · Vendor: apache

Share: LinkedIn · X · Reddit

Last updated 2026-08-05 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

apache activemq UPGRADE
Affected: < 5.19.9 · >= 6.0.0 and < 6.2.8
Fixed in: 5.19.9, 6.2.8
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 5.19.9 (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 all UPGRADE
Affected: < 5.19.9 · >= 6.0.0 and < 6.2.8
Fixed in: 5.19.9, 6.2.8
Safe to downgrade to: a release before 6.0.0
1. Check installed version
apt-cache policy activemq-all || rpm -q activemq-all || activemq-all --version
2. UPGRADE to 5.19.9 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade activemq-all
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade activemq-all
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-all sudo apt install activemq-all=<VERSION_BEFORE_6.0.0> sudo apt-mark hold activemq-all
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list activemq-all sudo dnf downgrade activemq-all-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add activemq-all
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 amqp UPGRADE
Affected: < 5.19.9 · >= 6.0.0 and < 6.2.8
Fixed in: 5.19.9, 6.2.8
Safe to downgrade to: a release before 6.0.0
1. Check installed version
apt-cache policy activemq-amqp || rpm -q activemq-amqp || activemq-amqp --version
2. UPGRADE to 5.19.9 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade activemq-amqp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade activemq-amqp
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-amqp sudo apt install activemq-amqp=<VERSION_BEFORE_6.0.0> sudo apt-mark hold activemq-amqp
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list activemq-amqp sudo dnf downgrade activemq-amqp-<VERSION_BEFORE_6.0.0> sudo dnf versionlock add activemq-amqp
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-2026-59878?

activemq: upgrade to 5.19.9, 6.2.8; activemq all: upgrade to 5.19.9, 6.2.8; activemq amqp: upgrade to 5.19.9, 6.2.8. Exact commands for each OS are on this page.

Is CVE-2026-59878 being exploited?

CVE-2026-59878 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-2026-59878 affect?

CVE-2026-59878 affects activemq, activemq all, activemq amqp. Severity is high (CVSS 7.5). Improper Input Validation vulnerability in Apache ActiveMQ AMQP, Apache ActiveMQ, Apache ActiveMQ All. A remote unauthenticated peer that can reach an exposed AMQP NIO connector can trigger denial-of-service behavior by sending a frame siz

How urgent is CVE-2026-59878?

Priority 50/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache ActiveMQ vulnerabilities

Related CVEs

References

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