Pillow: Heap buffer overflow in ImagingJpegDecode

影響: pip:Pillow <= 12.3.0 → 13.0.0

JpegImageFile.draft() — which Image.thumbnail() calls automatically — requests 1/2, 1/4 or 1/8 scaled JPEG output and shrinks self._size and the tile extents to match, so _setimage() allocates a single-row decode buffer of ceil(W/s) samples. ImagingJpegDecode() sets cinfo.scale_num/scale_denom, calls jpeg_start_decompress(), and then reads scanlines into that buffer without ever comparing cinfo.output_width, cinfo.output_height or cinfo.out_color_components against state->xsize, state->…

GitHub Advisory Databaseで読む

2026/10/21 05:40、GitHub Advisory Databaseが「Pillow: Heap buffer overflow in ImagingJpegDecode」を公開しました (種別: 脆弱性アドバイザリ)。重大度は「緊急」(critical) です。関連する技術: Python。CVE: CVE-2026-112403。