{"cve":"CVE-2021-28676","nvd":{"published":"2021-06-02T16:15:08.797","modified":"2026-06-17T03:46:46.600","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-835"],"references":["https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856","https://github.com/python-pillow/Pillow/pull/5377","https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/","https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos"],"products":["fedoraproject:fedora","python:pillow"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-28676","score":0.02501,"percentile":0.84705,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-7r7m-5h27-29hp","url":"https://osv.dev/vulnerability/GHSA-7r7m-5h27-29hp","summary":"Potential infinite loop in Pillow","modified":"2024-10-14T18:25:51.489802Z","packages":[{"ecosystem":"PyPI","name":"pillow","purl":"pkg:pypi/pillow","ranges":["<8.2.0"],"fixed":["8.2.0"]}]},{"id":"PYSEC-2021-92","url":"https://osv.dev/vulnerability/PYSEC-2021-92","summary":"","modified":"2023-12-06T01:01:01.865326Z","packages":[{"ecosystem":"PyPI","name":"pillow","purl":"pkg:pypi/pillow","ranges":["<8.2.0"],"fixed":["8.2.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}