CVE-2021-21391

Published: 29 April 2021

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.

Priority

CVSS 3 base score: 6.5

Status

Package	Release	Status
ckeditor Launchpad, Ubuntu, Debian	Upstream	Needs triage

	Ubuntu 21.04 (Hirsute Hippo)	Needs triage
	Ubuntu 20.04 LTS (Focal Fossa)	Needs triage
	Ubuntu 18.04 LTS (Bionic Beaver)	Needs triage
	Ubuntu 16.04 ESM (Xenial Xerus)	Ignored (end of standard support, was needs-triage)
	Ubuntu 14.04 ESM (Trusty Tahr)	Does not exist
ckeditor3 Launchpad, Ubuntu, Debian	Upstream	Needs triage

	Ubuntu 21.04 (Hirsute Hippo)	Needs triage
	Ubuntu 20.04 LTS (Focal Fossa)	Needs triage
	Ubuntu 18.04 LTS (Bionic Beaver)	Needs triage
	Ubuntu 16.04 ESM (Xenial Xerus)	Does not exist
	Ubuntu 14.04 ESM (Trusty Tahr)	Does not exist

CVE-2021-21391

Medium

Status

References

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