GHSA-hgmg-hhc8-g5wr

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Source
https://github.com/advisories/GHSA-hgmg-hhc8-g5wr
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/01/GHSA-hgmg-hhc8-g5wr/GHSA-hgmg-hhc8-g5wr.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-hgmg-hhc8-g5wr
Aliases
Published
2021-01-29T21:51:22Z
Modified
2026-05-07T05:02:13Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
CKEditor 5 Markdown plugin Regular expression Denial of Service
Details

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:

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.

Database specific 
{
    "cwe_ids":  [
        "CWE-400"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2021-01-29T21:50:43Z",
    "nvd_published_at":  "2021-01-29T22:15:00Z",
    "severity":  "MODERATE"
}
References

Affected packages

npm / @ckeditor/ckeditor5-markdown-gfm

Package

Name
@ckeditor/ckeditor5-markdown-gfm
View open source insights on deps.dev
Purl
pkg:npm/%40ckeditor/ckeditor5-markdown-gfm

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
25.0.0

Database specific

last_known_affected_version_range 
"<= 24.0.0"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/01/GHSA-hgmg-hhc8-g5wr/GHSA-hgmg-hhc8-g5wr.json"