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MEDIUM6.5

GHSA-3rh3-wfr4-76mj

Regular expression Denial of Service in multiple packages

Quick fix

GHSA-3rh3-wfr4-76mj — @ckeditor/ckeditor5-engine: upgrade to the fixed version with the command below.

npm install @ckeditor/ckeditor5-engine@27.0.0

Details

### Impact 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.

### Patches The problem has been recognized and patched. The fix will be available in version 27.0.0.

### For more information Email us at security@cksource.com if you have any questions or comments about this advisory.

### Acknowledgements The CKEditor 5 team would like to thank Yeting Li for recognizing and reporting these vulnerabilities.

Are you affected?

Enter the version of the package you're using.

Affected packages

npm/@ckeditor/ckeditor5-engine
Introduced in: 0Fixed in: 27.0.0
Fixnpm install @ckeditor/ckeditor5-engine@27.0.0
npm/@ckeditor/ckeditor5-font
Introduced in: 0Fixed in: 27.0.0
Fixnpm install @ckeditor/ckeditor5-font@27.0.0
npm/@ckeditor/ckeditor5-image
Introduced in: 0Fixed in: 27.0.0
Fixnpm install @ckeditor/ckeditor5-image@27.0.0
npm/@ckeditor/ckeditor5-list
Introduced in: 0Fixed in: 27.0.0
Fixnpm install @ckeditor/ckeditor5-list@27.0.0
npm/@ckeditor/ckeditor5-markdown-gfm
Introduced in: 0Fixed in: 27.0.0
Fixnpm install @ckeditor/ckeditor5-markdown-gfm@27.0.0
npm/@ckeditor/ckeditor5-media-embed
Introduced in: 0Fixed in: 27.0.0
Fixnpm install @ckeditor/ckeditor5-media-embed@27.0.0
npm/@ckeditor/ckeditor5-paste-from-office
Introduced in: 0Fixed in: 27.0.0
Fixnpm install @ckeditor/ckeditor5-paste-from-office@27.0.0
npm/@ckeditor/ckeditor5-widget
Introduced in: 0Fixed in: 27.0.0
Fixnpm install @ckeditor/ckeditor5-widget@27.0.0

References