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.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| @ckeditor/ckeditor5-engine(npm) | 0 | 27.0.0 | N/A |
| @ckeditor/ckeditor5-font(npm) | 0 | 27.0.0 | N/A |
| @ckeditor/ckeditor5-image(npm) | 0 | 27.0.0 | N/A |
| @ckeditor/ckeditor5-list(npm) | 0 | 27.0.0 | N/A |
| @ckeditor/ckeditor5-markdown-gfm(npm) | 0 | 27.0.0 | N/A |
| @ckeditor/ckeditor5-media-embed(npm) | 0 | 27.0.0 | N/A |
| @ckeditor/ckeditor5-paste-from-office(npm) | 0 | 27.0.0 | N/A |
| @ckeditor/ckeditor5-widget(npm) | 0 | 27.0.0 | N/A |
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