CVE-2026-57211
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedRabbitMQ 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA path traversal/SSRF vulnerability in RabbitMQ's management plugin static file handler on Windows allows attackers to inject URL-encoded backslashes (%5C) that bypass validation and cause the server to make outbound SMB/DNS connections to attacker-controlled UNC paths. This enables potential SMB relay attacks, DNS exfiltration, and lateral movement when multiple management extension plugins are enabled.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 4.1.0, < 4.2.6CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check RabbitMQ versionRun 'rabbitmqctl status' or check the RabbitMQ service version on WindowsAffected if Installed version is >= 4.1.0 and < 4.2.6
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Confirm Windows platformVerify the operating system is Windows (this vulnerability only affects Windows)Affected if Running on Windows
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Verify management plugin is enabledRun 'rabbitmq-plugins list' or check rabbitmq.conf for enabled management pluginsAffected if Management plugin (rabbitmq_management) is enabled
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Check for multiple management extensionsList all enabled RabbitMQ plugins that extend management functionality (e.g., rabbitmq_management_agent, community management plugins)Affected if Two or more management extension plugins are enabled concurrently
Affected if running on Windows with RabbitMQ version 4.1.0 to 4.2.5, management plugin enabled, and multiple management extension plugins are installed.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped4.2.6
Upgrade RabbitMQ to version 4.1.11 or 4.2.6 on Windows immediately. This is a critical infrastructure patch that eliminates the path validation bypass in the static file handler.
RabbitMQ Server 4.2.6 (or 4.1.11)
- 1. Backup your RabbitMQ configuration and data directory before upgrading
- 2. Stop the RabbitMQ service
- 3. Upgrade RabbitMQ Server to version 4.2.6 (recommended for production) or 4.1.11
- 4. Verify the upgrade by checking the RabbitMQ version: rabbitmqctl version
- 5. Ensure the management plugin is running: rabbitmq-plugins list --enabled
- 6. Restart the RabbitMQ service
- 7. Test that the management UI is accessible and the vulnerability is remediated
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-57211 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-57211 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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