Regular expression Denial of Service in multiple packages

中 6.5CVE-2021-21391 · GHSA-3rh3-wfr4-76mj · 29/04/2021 公開 · 17/06/2026 更新

要点

CVE-2021-21391 は ckeditor5-engine (ckeditor), ckeditor5-font (ckeditor), ckeditor5-image (ckeditor) に影響する深刻度「中」 (CVSS 6.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：1.7%（全脆弱性の 76.8% より高い）。
対処：27.0.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
ckeditor5-engine ckeditor	`< 27.0.0`	`27.0.0`
ckeditor5-font ckeditor	`< 27.0.0`	`27.0.0`
ckeditor5-image ckeditor	`< 27.0.0`	`27.0.0`
ckeditor5-list ckeditor	`< 27.0.0`	`27.0.0`
ckeditor5-markdown-gfm ckeditor	`< 27.0.0`	`27.0.0`
ckeditor5-media-embed ckeditor	`< 27.0.0`	`27.0.0`
ckeditor5-paste-from-office ckeditor	`< 27.0.0`	`27.0.0`
ckeditor5-widget ckeditor	`< 27.0.0`	`27.0.0`
@ckeditor/ckeditor5-engine npm	`< 27.0.0`	`27.0.0`
@ckeditor/ckeditor5-font npm	`< 27.0.0`	`27.0.0`
@ckeditor/ckeditor5-image npm	`< 27.0.0`	`27.0.0`
@ckeditor/ckeditor5-list npm	`< 27.0.0`	`27.0.0`
@ckeditor/ckeditor5-markdown-gfm npm	`< 27.0.0`	`27.0.0`
@ckeditor/ckeditor5-media-embed npm	`< 27.0.0`	`27.0.0`
@ckeditor/ckeditor5-paste-from-office npm	`< 27.0.0`	`27.0.0`
@ckeditor/ckeditor5-widget npm	`< 27.0.0`	`27.0.0`

概要

Impact

A regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0.

Patches

The problem has been recognized and patched. The fix will be available in version 27.0.0.

For more information

Email us at [email protected] if you have any questions or comments about this advisory.

Acknowledgements

The CKEditor 5 team would like to thank Yeting Li for recognizing and reporting these vulnerabilities.

NVD の説明

CKEditor 5 provides a WYSIWYG editing solution. This CVE affects the following npm packages: ckeditor5-engine, ckeditor5-font, ckeditor5-image, ckeditor5-list, ckeditor5-markdown-gfm, ckeditor5-media-embed, ckeditor5-paste-from-office, and ckeditor5-widget. Following an internal audit, a regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0. The problem has been recognized and patched. The fix will be available in version 27.0.0.