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Group 4 images (now written by Create PDF and the optimizer) would otherwise stop exporting: they were reported as "can't be exported yet". A CCITT fax image (its only filter) is decoded through hayro-ccitt with its /DecodeParms (K, Columns, Rows, EndOfBlock, EndOfLine, EncodedByteAlign, BlackIs1), masks included; /Columns has to be the image's width, so a hostile value can't size the buffers. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BfMGHQNgdq5yf5tKZHGR3z