PYSEC-2026-3494 Pillow TGA RLE encoder can serialize up to ~57 KB of adjacent heap data into generated images

Summary Pillow's TGA RLE encoder reads past its row buffer when saving a mode "1" image. Adjacent process heap bytes can be copied into the generated TGA file. The bug is reachable through the public save API: python im.saveout, format="TGA", compression="tgarle" Older affected Pillow versions us...