CVE-2021-21254 – @ckeditor/ckeditor5-markdown-gfm

Package

Manager: npm
Name: @ckeditor/ckeditor5-markdown-gfm
Vulnerable Version: >=0 <25.0.0

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00369 pctl0.57976

Details

CKEditor 5 Markdown plugin Regular expression Denial of Service ### Impact 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. It affects all users using the CKEditor 5 Markdown plugin at version <= 24.0.0. ### Patches The problem has been recognized and patched. The fix will be available in version 25.0.0. ### Workarounds The user can work around the issue by: - Upgrading CKEditor 5 to version 25.0.0. - Disabling the Markdown plugin. ### More information If you have any questions or comments about this advisory: * Email us at [security@cksource.com](mailto:security@cksource.com) ### Acknowledgements The CKEditor 5 team would like to thank Erik Krogh Kristensen from the GitHub team for recognizing this vulnerability and Alvaro Muñoz from GitHub for reporting it.

Metadata

Created: 2021-01-29T21:51:22Z
Modified: 2022-08-11T18:16:15Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/01/GHSA-hgmg-hhc8-g5wr/GHSA-hgmg-hhc8-g5wr.json
CWE IDs: ["CWE-400"]
Alternative ID: GHSA-hgmg-hhc8-g5wr
Finding: F002
Auto approve: 1