Regular expression Denial of Service in multiple packages
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-21391
Credits & Attribution
No credits recorded in the NVD database.
References
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-engine
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-font
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-image
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-list
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-media-embed
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-paste-from-office
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-widget
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