https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-20T02:44:07.995722+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/cnvd-2021-39674 cnvd-2021-39674 2026-10-20T02:44:07.999689+00:00 cnvd-2021-39674 https://cve.radiocsirt.org/vuln/euvd-2026-22187 EUVD-2026-22187 2026-10-20T02:44:07.999731+00:00 EUVD-2026-22187 https://cve.radiocsirt.org/vuln/fkie_cve-2021-21391 fkie_cve-2021-21391 2026-10-20T02:44:07.999753+00:00

CKEditor 5 provides a WYSIWYG editing solution. This CVE affects the following npm packages: ckeditor5-engine, ckeditor5-font, ckeditor5-image, ckeditor5-list, ckeditor5-markdown-gfm, ckeditor5-media-embed, ckeditor5-paste-from-office, and ckeditor5-widget. Following an internal audit, a regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0. The problem has been recognized and patched. The fix will be available in version 27.0.0.

 https://cve.radiocsirt.org/vuln/ghsa-3rh3-wfr4-76mj GHSA-3rh3-wfr4-76mj — Regular expression Denial of Service in multiple packages 2026-10-20T02:44:07.999808+00:00

Affected: npm: @ckeditor/ckeditor5-engine, npm: @ckeditor/ckeditor5-font, npm: @ckeditor/ckeditor5-image, npm: @ckeditor/ckeditor5-list, npm: @ckeditor/ckeditor5-markdown-gfm, npm: @ckeditor/ckeditor5-media-embed, npm: @ckeditor/ckeditor5-paste-from-office, npm: @ckeditor/ckeditor5-widget

### Impact A regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0.

### Patches The problem has been recognized and patched. The fix will be available in version 27.0.0.

### For more information Email us at security@cksource.com if you have any questions or comments about this advisory.

### Acknowledgements The CKEditor 5 team would like to thank Yeting Li for recognizing and reporting these vulnerabilities.

 https://cve.radiocsirt.org/vuln/gsd-2021-21391 gsd-2021-21391 2026-10-20T02:44:07.999895+00:00 gsd-2021-21391 https://cve.radiocsirt.org/vuln/ubuntu-cve-2021-21391 UBUNTU-CVE-2021-21391 2026-10-20T02:44:07.999917+00:00

Affected: Ubuntu:18.04:LTS: ckeditor3, Ubuntu:20.04:LTS: ckeditor3, Ubuntu:22.04:LTS: ckeditor3, Ubuntu:24.04:LTS: ckeditor3

CKEditor 5 provides a WYSIWYG editing solution. This CVE affects the following npm packages: ckeditor5-engine, ckeditor5-font, ckeditor5-image, ckeditor5-list, ckeditor5-markdown-gfm, ckeditor5-media-embed, ckeditor5-paste-from-office, and ckeditor5-widget. Following an internal audit, a regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0. The problem has been recognized and patched. The fix will be available in version 27.0.0.