Secure File Uploads in Flask: Filtering and Validation Techniques
ID: 40c7025c-ffa8-5b4d-82f8-c92b56271460
STIX ID: report--40c7025c-ffa8-5b4d-82f8-c92b56271460
Feed Name: HackerOne Blog
This blog-style guide explains secure file upload practices in Flask, outlining risks (malware uploads, file inclusion/RCE, and storage exhaustion) and recommending layered defenses including filename sanitization, extension whitelists, MIME-type validation (using python-magic), file size limits (Flask and web server settings), and optional antivirus scanning (ClamAV/pyclamd).
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