CVE-2021-21391
Regular expression Denial of Service in multiple packages
- State
- Published
- Severity
- 6.5 Medium
- Published
- Apr 29, 2021
- Updated
- Aug 3, 2024
- Reserved
- Dec 22, 2020
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | GitHub_M |
Weaknesses
- CWE-400 Uncontrolled Resource Consumption
Affected Products
| Product | Versions |
|---|---|
ckeditor5ckeditor |
|
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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