Pillow: NULL pointer dereference in Image.merge via an unvalidated band 0

影響: pip:pillow >= 12.0.0, < 13.0.0 → 13.0.0

Image.merge() checks the mode of every input band except band 0. If band 0 is a single-band I or F image, the native merge routine reads a pixel pointer that is NULL for those modes and the process crashes. The IPTC plugin reaches this from a plain Image.open() followed by a load, and IPTC has no magic-byte prefilter, so a crafted file with no recognizable header can drive it. Details The validation loop skips band 0: - src/PIL/Image.py:3795 iterates for band in bands[1:] and checks mod…

GitHub Advisory Databaseで読む

2026/10/22 05:30、GitHub Advisory Databaseが「Pillow: NULL pointer dereference in Image.merge via an unvalidated band 0」を公開しました (種別: 脆弱性アドバイザリ)。重大度は「重要」(high) です。関連する技術: Python。CVE: CVE-2026-112405。