{"id":"PYSEC-2026-4333","details":"Pillow is a Python imaging library. From 12.0.0 until 13.0.0, Pillow's Image.merge() can dereference a null image8 plane. Validation skips the first input band, allowing a 32-bit integer or floating-point image backed by image32 storage to be merged as a narrower multiband image. A crafted IPTC file can reach this path when an application opens and loads it, or a caller can invoke Image.merge() directly with such a first band. This causes a native process crash. This issue is fixed in version 13.0.0.","aliases":["BIT-pillow-2026-112405","CVE-2026-112405","GHSA-cp9v-662q-vvx9"],"modified":"2026-10-28T11:10:36.014536437Z","published":"2026-10-19T22:17:08.027Z","references":[{"type":"ADVISORY","url":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0"},{"type":"FIX","url":"https://github.com/python-pillow/Pillow/commit/b6ee66e8b2c2c0932bdf65f963268d9f2927ef86"},{"type":"EVIDENCE","url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-cp9v-662q-vvx9"}],"affected":[{"package":{"name":"pillow","ecosystem":"PyPI","purl":"pkg:pypi/pillow"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"12.0.0"},{"fixed":"13.0.0"}]}],"versions":["12.0.0","12.1.0","12.1.1","12.2.0","12.3.0"],"ecosystem_specific":{},"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/pillow/PYSEC-2026-4333.yaml"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}