Bug 1922522 (CVE-2021-21254) - CVE-2021-21254 ckeditor: Denial of service in link recognition regular expression
Summary: CVE-2021-21254 ckeditor: Denial of service in link recognition regular expres...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-21254
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1922523 1922524
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-01-30 00:40 UTC by Pedro Sampaio
Modified: 2021-01-30 02:41 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2021-01-30 02:41:38 UTC
Embargoed:

Attachments (Terms of Use)

Description Pedro Sampaio 2021-01-30 00:40:23 UTC 
CKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm) before version 25.0.0 has a regex denial of service (ReDoS) vulnerability. The vulnerability allowed to abuse link recognition regular expression, which could cause a significant performance drop resulting in browser tab freeze. It affects all users using CKEditor 5 Markdown plugin at version <= 24.0.0. The problem has been recognized and patched. The fix will be available in version 25.0.0.

https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0
https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr
https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm
Comment 1 Pedro Sampaio 2021-01-30 00:40:58 UTC 
Created ckeditor tracking bugs for this issue:

Affects: epel-7 [bug 1922524]
Affects: fedora-all [bug 1922523]
Comment 2 Product Security DevOps Team 2021-01-30 02:41:38 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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