Security vulnerabilities and automated fixes for directory traversal issues
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A critical path traversal vulnerability in a ZMODEM file receiver allowed a malicious sender to supply crafted filenames containing directory traversal sequences (like `../../.ssh/authorized_keys`), causing the receiver to write file contents to arbitrary locations on the filesystem. The fix strips path separators and validates filenames before use, ensuring received files can only be written to the intended download directory. This class of vulnerability is a stark reminder that any input origi