{"id":"BIT-pillow-2026-112891","summary":"Pillow: Quadratic GIF comment copying during save","details":"Pillow is a Python imaging library. From 9.2.0 until 13.0.0, Pillow performs quadratic copying when saving a GIF with a long comment. _get_global_header() repeatedly copies portions of comment data while assembling the global header, including comments retained from an untrusted input image. An attacker can supply an image with a large GIF comment to an application that saves it as GIF. This can consume excessive CPU and delay or deny service. This issue is fixed in version 13.0.0.","aliases":["CVE-2026-112891","GHSA-fc9g-5qg7-mf45"],"modified":"2026-10-26T08:56:06.483214483Z","published":"2026-10-26T05:55:51.869Z","database_specific":{"cpes":["cpe:2.3:a:python:pillow:*:*:*:*:*:python:*:*"],"severity":"Medium"},"references":[{"type":"WEB","url":"https://github.com/python-pillow/Pillow/commit/68a3fe957d8a4d552e8c69d96066d749f0614c7e"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-fc9g-5qg7-mf45"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112891"}],"affected":[{"package":{"name":"pillow","ecosystem":"Bitnami","purl":"pkg:bitnami/pillow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"9.2.0"},{"fixed":"13.0.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/pillow/BIT-pillow-2026-112891.json"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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":"1.9.0"}