What is GHSA-hgmg-hhc8-g5wr?

GHSA-hgmg-hhc8-g5wr is a security advisory published by GitHub Security Advisories with Medium severity. CKEditor 5 Markdown plugin Regular expression Denial of Service

Which CVE IDs does GHSA-hgmg-hhc8-g5wr cover?

GHSA-hgmg-hhc8-g5wr covers the following CVE IDs: CVE-2021-21254. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-hgmg-hhc8-g5wr?

GHSA-hgmg-hhc8-g5wr has a CVSS v3 base score of 6.5, published by GitHub Security Advisories.

Which products are affected by GHSA-hgmg-hhc8-g5wr?

GHSA-hgmg-hhc8-g5wr affects 1 product, including: npm/@ckeditor/ckeditor5-markdown-gfm:\u003c= 24.0.0.

GHSA-hgmg-hhc8-g5wrMediumCVSS 6.5

CKEditor 5 Markdown plugin Regular expression Denial of Service

Vendor

GitHub Security Advisories

Published

January 29, 2021

Last Modified

January 30, 2023

🔗 CVE IDs covered (1)

CVE-2021-21254 →

📋 Description

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 [email protected]

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.

🎯 Affected products1

npm/@ckeditor/ckeditor5-markdown-gfm:<= 24.0.0