{"id":"BIT-pillow-2026-112399","summary":"Pillow: APNG background disposal allocates full canvas before decompression bomb check","details":"Pillow is a Python imaging library. From 8.1.0 until 13.0.0, Pillow can allocate an APNG disposal background at the full canvas size before applying the decompression-bomb check. A crafted APNG with a small first frame, a very large declared canvas, and background disposal or first-frame OP_PREVIOUS reaches PngImageFile._seek while Image.open() positions frame zero. The full-canvas allocation occurs inside Image.open() without requiring pixel loading or frame iteration. This can exhaust memory and deny service. This issue is fixed in version 13.0.0.","aliases":["CVE-2026-112399","GHSA-5xm2-6676-qcp9"],"modified":"2026-10-29T10:45:09.211088921Z","published":"2026-10-26T05:55:42.079Z","database_specific":{"cpes":["cpe:2.3:a:python:pillow:*:*:*:*:*:python:*:*"],"severity":"High"},"references":[{"type":"FIX","url":"https://github.com/python-pillow/Pillow/commit/f1acfc54c53502948d0d14121872061df931db48"},{"type":"ARTICLE","url":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0"},{"type":"ADVISORY","url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-5xm2-6676-qcp9"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112399"}],"affected":[{"package":{"name":"pillow","ecosystem":"Bitnami","purl":"pkg:bitnami/pillow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.1.0"},{"fixed":"13.0.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/pillow/BIT-pillow-2026-112399.json"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.9.2"}