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CVE-2026-57211 is a vulnerability in RabbitMQ on Windows affecting versions prior to 4.1.11 and 4.2.6. The issue resides in the RabbitMQ management plugin static file handler, rabbit_mgmt_wm_static, which can pass URL-encoded backslashes to erl_prim_loader:read_file_info before path validation when multiple management extension plugins are enabled. This allows crafted requests to influence file path resolution so that Windows UNC paths are accessed during processing. As a result, the vulnerable component can initiate outbound DNS and SMB requests to attacker-controlled network locations before validation is applied.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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