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## Catalog CSV import rejects files with invalid header encoding

Product CSV imports now fail with a clear error when the file's header row contains invalid character encoding, instead of importing with a corrupted column mapping.

* **Header encoding validation**: the header row must use UTF-8 encoding, matching the existing requirement for data rows. A file with an invalid header now stops the import and reports which column failed.

For details, see [error handling during catalog migration](/developer/docs/admin/catalog-and-inventory/data-migration/catalog/error-handling).