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Why checking file extensions is dangerous, and how we verify binary signatures before storing files in private Cloudflare R2 buckets.
Serkan Kaya
BAYAKA co-founder
file.type or File ExtensionsAn attacker can easily rename malware.exe to resume.pdf. Before accepting any CV or project deliverable, our server inspects the actual binary magic bytes (%PDF-, PK\x03\x04, PNG/JPEG headers) and rejects any executable or script payload.
Written by
Serkan Kaya
Co-founder of BAYAKA Software.