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CVE-2026-48711 is a high-severity argument injection vulnerability in SSHFS affecting versions 1.4 through 3.7.5. SSHFS accepts bracketed mount sources intended to represent host components, and during processing, find_base_path() strips the surrounding brackets as though the value were an IPv6 literal. If the resulting normalized host begins with a hyphen, SSHFS passes that value directly to the ssh client without validating that it is a legitimate hostname. This allows a crafted mount source to be reinterpreted by ssh as a command-line option rather than a destination host. Under the documented exploitation condition where the caller also supplies a path-valued sftp_server, ssh treats the attacker-controlled normalized host as an option and the server path as the destination argument. An injected ProxyCommand can then be executed locally before any SSH connection establishment or authentication succeeds.
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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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