{"schema_version":"1.8.0","id":"CVE-2021-28676","published":"2021-06-02T16:15:08.797Z","modified":"2026-08-07T16:49:50.584047Z","aliases":["BIT-pillow-2021-28676","GHSA-7r7m-5h27-29hp","PYSEC-2021-92"],"related":["ALSA-2021:4149","SUSE-SU-2021:1938-1","SUSE-SU-2021:1939-1","SUSE-SU-2021:1940-1","SUSE-SU-2024:1607-1"],"details":"An issue was discovered in Pillow before 8.2.0. For FLI data, FliDecode did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/python-pillow/pillow","events":[{"introduced":"0"},{"fixed":"e0e353c0ef7516979a9aedce3792596649ce4433"},{"fixed":"bb6c11fb889e6c11b0ee122b828132ee763b5856"}],"database_specific":{"cpe":"cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"8.2.0"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["8.1.0","8.0.0","7.2.0","7.1.0","7.0.0","6.2.0","6.1.0","6.0.0","5.4.0","5.3.0","5.2.0","5.1.0","5.0.0","4.3.0","4.2.0","4.1.0","4.0.0","4.0.0a","3.4.0","3.3.0","3.2.0","3.1.0","3.1.0-rc1","2.9.0","2.9.0.dev2","2.9.0.dev1","2.9.0.dev0","2.8.1","2.8.0","2.7.0","2.5.0","2.3.0","2.2.1","2.2.0","2.1.0","2.0.0","1.7.8","1.7.7","1.2","1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-28676.json","vanir_signatures":[{"deprecated":false,"digest":{"line_hashes":["276082854084581862752233006547183163125","154487951280376738261317199800104056040","196791183223561229908953348714930460735","108716279980050847017816890668636521998"],"threshold":0.9},"id":"CVE-2021-28676-0f8c3b10","signature_type":"Line","signature_version":"v1","source":"https://github.com/python-pillow/pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856","target":{"file":"src/libImaging/FliDecode.c"}},{"deprecated":false,"digest":{"function_hash":"90249710371010666261709649153104395496","length":3966},"id":"CVE-2021-28676-89bdf835","signature_type":"Function","signature_version":"v1","source":"https://github.com/python-pillow/pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856","target":{"file":"src/libImaging/FliDecode.c","function":"ImagingFliDecode"}}],"vanir_signatures_modified":"2026-08-07T16:49:50Z"}}],"references":[{"type":"ADVISORY","url":"https://github.com/python-pillow/Pillow/pull/5377"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html"},{"type":"ADVISORY","url":"https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202107-33"},{"type":"FIX","url":"https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856"},{"type":"ARTICLE","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/"}],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"33"},{"last_affected":"33"}],"source":"CPE_STRING","vendor_product":"fedoraproject:fedora"}]},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}