A malicious W3.7z might contain entries like ../../etc/shadow. By default, 7-Zip sanitizes paths, but older versions (pre-16.04) were vulnerable.
Defense: Update to 7-Zip 22.01 or later.
Because .7z is not natively supported on all operating systems, here are the verified methods. A malicious W3
If you discover a W3.7z file in a forensic investigation (e.g., seized hard drive), remember: 7-Zip sanitizes paths
From a business policy standpoint: Many organizations prohibit .7z files in email attachments because of the encryption capability (bypassing DLP). If you export logs as W3.7z, always store the decryption key in a separate, audited system. seized hard drive)