{"action":"Upgrade ckeditor to 4.16.0+dfsg-1 or later.","affected":[{"fixed":"4.16.0+dfsg-1","introduced":"0"}],"component":"ckeditor","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["4.16.0+dfsg-1"],"id":"tcs_01M5NFG6Q1PPVNMK7KS4NVQV98","modified_at":"2026-10-23T18:03:02.979957182Z","published_at":"2021-01-26T21:15:12.860Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-26271","https://security-tracker.debian.org/tracker/CVE-2021-26271"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-26271","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-26271"}],"summary":"It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plu"}