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CVE-2026-57211: RabbitMQ is a messaging and streaming broker

45
This week
MEDIUM 6.5REMOTEUPGRADE

CVE-2026-57211 is a medium-severity flaw (CVSS 6.5) 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 4.1.11 and 4.2.6 on Windows, the RabbitMQ management plugin static file handler rabbit_mgmt_wm_static can pass URL-encoded backslashes to erl_prim_loader:read_file_info before path validation when multiple management extension plugins are enabled, causing outbound DNS and SMB requests to attacker-controlled UNC paths. This issue is fixed in versions 4.1.11 and 4.2.6.

Why this priority

  • Public exploit reference
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.6% (top 50%)
CISA exploited listNo
WeaknessCWE-36, CWE-918
Published2026-07-10
Last modified2026-10-25
Publisher (CNA): GitHub, Inc. · Vendor: broadcom

Share: LinkedIn · X · Reddit

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

broadcom rabbitmq server UPGRADE
Affected: >= 4.1.0 and < 4.2.6
Fixed in: 4.2.6
Safe to downgrade to: a release before 4.1.0
1. Check installed version
apt-cache policy rabbitmq-server || rpm -q rabbitmq-server || rabbitmq-server --version
2. UPGRADE to 4.2.6 (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 4.1.0 (Debian / Ubuntu)
apt-cache madison rabbitmq-server sudo apt install rabbitmq-server=<VERSION_BEFORE_4.1.0> 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_4.1.0> 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-2026-57211?

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

Is CVE-2026-57211 being exploited?

CVE-2026-57211 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-2026-57211 affect?

CVE-2026-57211 affects rabbitmq server. Severity is medium (CVSS 6.5). RabbitMQ is a messaging and streaming broker. Prior to 4.1.11 and 4.2.6 on Windows, the RabbitMQ management plugin static file handler rabbit_mgmt_wm_static can pass URL-encoded backslashes to erl_prim_loader:read_file_info before path vali

How urgent is CVE-2026-57211?

Priority 45/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities · RabbitMQ vulnerabilities

Related CVEs

References

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