CVE-2021-21254: Uncontrolled Resource Consumption

January 29, 2021 (updated February 1, 2021)

CKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm) 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 The problem has been recognized and patched.

References

nvd.nist.gov/vuln/detail/CVE-2021-21254

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