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Mittel 5.3Linux-Server

activestorage: Active Storage: File size validation bypass via missing direct-upload content length constraints

CVE-2026-126085activestorage10. Nov 2026

### Impact `ActiveStorage::Service::GCSService#url_for_direct_upload` does not bind the declared content length into the signed direct-upload URL, and `#headers_for_direct_upload` returns no length constraint, so the URL authorizes an upload body of any size. A direct-upload client could store a file larger than the `byte_size` it declared, and the resulting blob keeps the declared size, possibly bypassing application file size validations and quotas. This is the weakness…