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CVE-2026-67411: RabbitMQ is a messaging and streaming broker

36
Routine
HIGH 7.1UPGRADE

CVE-2026-67411 is a high-severity flaw (CVSS 7.1) affecting rabbitmq server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restrict

Why this priority

  • High severity
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score7.1 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.3% (top 75%)
CISA exploited listNo
WeaknessCWE-863
Published2026-09-25
Last modified2026-10-08
Publisher (CNA): GitHub, Inc. · Vendor: broadcom

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Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

broadcom rabbitmq server UPGRADE
Affected: >= 3.13.0 and < 3.13.18 · >= 4.0.0 and < 4.0.23 · >= 4.1.0 and < 4.1.14 · >= 4.2.0 and < 4.2.9 · >= 4.3.0 and < 4.3.3
Fixed in: 3.13.18, 4.0.23, 4.1.14, 4.2.9, 4.3.3
Safe to downgrade to: a release before 3.13.0
1. Check installed version
apt-cache policy rabbitmq-server || rpm -q rabbitmq-server || rabbitmq-server --version
2. UPGRADE to 3.13.18 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade rabbitmq-server
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade rabbitmq-server
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 3.13.0 (Debian / Ubuntu)
apt-cache madison rabbitmq-server sudo apt install rabbitmq-server=<VERSION_BEFORE_3.13.0> sudo apt-mark hold rabbitmq-server
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list rabbitmq-server sudo dnf downgrade rabbitmq-server-<VERSION_BEFORE_3.13.0> sudo dnf versionlock add rabbitmq-server
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-2026-67411?

rabbitmq server: upgrade to 3.13.18, 4.0.23, 4.1.14, 4.2.9, 4.3.3. Exact commands for each OS are on this page.

Is CVE-2026-67411 being exploited?

CVE-2026-67411 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-2026-67411 affect?

CVE-2026-67411 affects rabbitmq server. Severity is high (CVSS 7.1). RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the M

How urgent is CVE-2026-67411?

Priority 36/100. High severity; Public exploit reference

Software pages

RabbitMQ vulnerabilities

Related CVEs

References

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