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Moderate severityNVD Advisory· Published Apr 29, 2021· Updated Aug 3, 2024

Regular expression Denial of Service in multiple packages

CVE-2021-21391

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.

AI Insight

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
@ckeditor/ckeditor5-enginenpm
< 27.0.027.0.0
@ckeditor/ckeditor5-fontnpm
< 27.0.027.0.0
@ckeditor/ckeditor5-imagenpm
< 27.0.027.0.0
@ckeditor/ckeditor5-listnpm
< 27.0.027.0.0
@ckeditor/ckeditor5-markdown-gfmnpm
< 27.0.027.0.0
@ckeditor/ckeditor5-media-embednpm
< 27.0.027.0.0
@ckeditor/ckeditor5-paste-from-officenpm
< 27.0.027.0.0
@ckeditor/ckeditor5-widgetnpm
< 27.0.027.0.0

Affected products

9

Patches

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References

20

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