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CVE-2026-67404: RabbitMQ is a messaging and streaming broker

33
Routine
HIGH 7.4REMOTEUPGRADE

CVE-2026-67404 is a high-severity flaw (CVSS 7.4) 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. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, When no CA bundle is available, ssl_options/1 falls back to [{verify, verify_none}] with no warning. An attacker in a man-in-the-middle position can forge the JWKS response, which leads the broker to accept arbitrary JWTs. Preconditions include The OAuth2 plugin must be in use with no cacertfile configured and the OS CA bundle empty or unrea

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.4 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.2% (top 90%)
CISA exploited listNo
WeaknessCWE-295
Published2026-09-23
Last modified2026-10-19
Publisher (CNA): GitHub, Inc. · Vendor: broadcom

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Last updated 2026-10-19 · 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 < 3.13.15 · >= 4.0.0 and < 4.0.20 · >= 4.1.0 and < 4.1.11 · >= 4.2.0 and < 4.2.6
Fixed in: 3.13.15, 4.0.20, 4.1.11, 4.2.6
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 3.13.15 (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-2026-67404?

rabbitmq server: upgrade to 3.13.15, 4.0.20, 4.1.11, 4.2.6. Exact commands for each OS are on this page.

Is CVE-2026-67404 being exploited?

CVE-2026-67404 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-2026-67404 affect?

CVE-2026-67404 affects rabbitmq server. Severity is high (CVSS 7.4). RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, When no CA bundle is available, ssl_options/1 falls back to [{verify, verify_none}] with no warning. An attacker in a man-in-the-midd

How urgent is CVE-2026-67404?

Priority 33/100. High severity; Remotely exploitable, no login, no user action

Software pages

RabbitMQ vulnerabilities

Related CVEs

References

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