CKEditor 5 Markdown plugin Regular expression Denial of Service

Description

A regular expression denial of service (ReDoS) vulnerability has been discovered in the CKEditor 5 Markdown plugin code. The vulnerability allowed to abuse a link recognition regular expression, which could cause a significant performance drop resulting in a browser tab freeze.

Recommendation

Update the @ckeditor/ckeditor5-markdown-gfm package to the latest compatible version. Followings are version details:

• Affected version(s): <= 24.0.0
• Patched version(s): 25.0.0

References

• GHSA-hgmg-hhc8-g5wr
• www.npmjs.com
• CVE-2021-21254
• CWE-400
• CAPEC-310
• OWASP 2021-A6

Related Issues

• Regular expression Denial of Service in multiple packages - @ckeditor/ckeditor5-media-embed - CVE-2021-21391
• Regular expression Denial of Service in multiple packages - @ckeditor/ckeditor5-list - CVE-2021-21391
• Regular expression Denial of Service in multiple packages - @ckeditor/ckeditor5-paste-from-office - CVE-2021-21391
• Regular expression Denial of Service in multiple packages - @ckeditor/ckeditor5-widget - CVE-2021-21391

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Tags:

npm

@ckeditor/ckeditor5-markdown-gfm