{"id":"GHSA-jv4c-7jqq-m34x","summary":"CKEditor 4 ReDoS Vulnerability","details":"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 plugin).","aliases":["CVE-2021-26271"],"modified":"2026-09-10T03:49:39.067777385Z","published":"2022-05-24T17:40:21Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2024-04-22T23:14:44Z","nvd_published_at":"2021-01-26T21:15:00Z","cwe_ids":["CWE-1333"]},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26271"},{"type":"PACKAGE","url":"https://github.com/ckeditor/ckeditor4"},{"type":"WEB","url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416"},{"type":"WEB","url":"https://web.archive.org/web/20210128132707/https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first"},{"type":"WEB","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"}],"affected":[{"package":{"name":"ckeditor4-dev","ecosystem":"npm","purl":"pkg:npm/ckeditor4-dev"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.16"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-jv4c-7jqq-m34x/GHSA-jv4c-7jqq-m34x.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}