Vulnerability CVE-2021-21391
Published: 2021-04-29

Description:
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.

Type:

CWE-400

 (Uncontrolled Resource Consumption ('Resource Exhaustion'))

 References:
https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm
https://www.npmjs.com/package/@ckeditor/ckeditor5-engine
https://www.npmjs.com/package/@ckeditor/ckeditor5-image
https://www.npmjs.com/package/@ckeditor/ckeditor5-media-embed
https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj
https://www.npmjs.com/package/@ckeditor/ckeditor5-list
https://www.npmjs.com/package/@ckeditor/ckeditor5-font
https://www.npmjs.com/package/@ckeditor/ckeditor5-paste-from-office
https://www.npmjs.com/package/@ckeditor/ckeditor5-widget
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