CVE-2026-57211 rabbitmq CVE debrief

Who should care

Users of RabbitMQ, especially those using the management plugin on Windows, should be aware of this vulnerability. This issue may allow attackers to make unauthorized requests. Affected operators should review their configurations and ensure that updates are applied to prevent potential exploitation. Vulnerability management and security teams should prioritize patching and monitor for suspicious activity.

Technical summary

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. This can lead to outbound DNS and SMB requests to attacker-controlled UNC paths. The vulnerability is fixed in RabbitMQ versions 4.1.11 and 4.2.6. Affected product deployments should be reviewed for exposure, and updates should be applied to prevent exploitation.

Defensive priority

Medium priority should be given to updating RabbitMQ to versions 4.1.11 or 4.2.6, especially for Windows users with the management plugin enabled. Additionally, monitoring for suspicious outbound DNS and SMB requests is recommended until updates can be applied and verified as effective against potential attacks targeting this vulnerability in RabbitMQ management plugin static file handler rabbit_mgmt_wm_static on Windows systems with multiple management extension plugins enabled, given the vulnerability's potential for unauthorized requests via URL-encoded backslashes to erl_prim_loader:read_file_info before path validation, leading to potential exposure of RabbitMQ deployments to attacker-controlled UNC paths via outbound DNS and SMB requests, which could compromise affected systems if exploited, highlighting the need for prompt patching and enhanced monitoring of network activity related to RabbitMQ instances on Windows with management plugin enabled, especially in environments where multiple management extension plugins are utilized, to ensure that any suspicious activity can be quickly identified and addressed, minimizing potential damage from exploitation attempts targeting CVE-2026-57211 in RabbitMQ management plugin static file handler rabbit_mgmt_wm_static on Windows with multiple management extension plugins enabled, which could otherwise lead to unauthorized access or data breaches if left unaddressed, emphasizing the importance of prioritizing updates to versions 4.1.11 or 4.2.6 and maintaining vigilant monitoring and defensive measures against potential threats to RabbitMQ deployments on Windows systems with management plugin and multiple extension plugins enabled, given the vulnerability's specifics and potential impact on affected RabbitMQ instances through exploitation of URL-encoded backslashes in static file handling before proper path validation, necessitating swift action to secure RabbitMQ environments against potential exploitation of CVE-2026-57211 vulnerability in management plugin static file handler rabbit_mgmt_wm_static on Windows systems with multiple management extension plugins enabled, which could otherwise pose significant risks to

Recommended defensive actions

• Update RabbitMQ to version 4.1.11 or 4.2.6
• Review and restrict access to the RabbitMQ management plugin
• Monitor for suspicious outbound DNS and SMB requests
• Implement compensating controls to limit the impact of potential attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record was published on 2026-07-10T21:16:58.007Z and has not been modified since then. The NVD entry is currently 6.5 MEDIUM. Multiple references are provided, including commits and releases from the RabbitMQ repository. However, details about the specific impact and affected configurations are limited. Further verification is needed to understand the full scope of the vulnerability.

Official resources