{
"id": "GHSA-3rh3-wfr4-76mj",
"aliases": [
"CVE-2021-21391"
],
"details": "\n### Impact\nA 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.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 27.0.0.\n\n### For more information\nEmail us at [email protected] if you have any questions or comments about this advisory.\n\n### Acknowledgements\nThe CKEditor 5 team would like to thank Yeting Li for recognizing and reporting these vulnerabilities.",
"summary": "Regular expression Denial of Service in multiple packages",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "27.0.0"
}
]
}
],
"package": {
"name": "@ckeditor/ckeditor5-engine",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 26.0.0"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "27.0.0"
}
]
}
],
"package": {
"name": "@ckeditor/ckeditor5-font",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 26.0.0"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "27.0.0"
}
]
}
],
"package": {
"name": "@ckeditor/ckeditor5-image",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 26.0.0"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "27.0.0"
}
]
}
],
"package": {
"name": "@ckeditor/ckeditor5-list",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 26.0.0"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "27.0.0"
}
]
}
],
"package": {
"name": "@ckeditor/ckeditor5-markdown-gfm",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 26.0.0"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "27.0.0"
}
]
}
],
"package": {
"name": "@ckeditor/ckeditor5-media-embed",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 26.0.0"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "27.0.0"
}
]
}
],
"package": {
"name": "@ckeditor/ckeditor5-paste-from-office",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 26.0.0"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "27.0.0"
}
]
}
],
"package": {
"name": "@ckeditor/ckeditor5-widget",
"ecosystem": "npm"
},
"database_specific": {
"last_known_affected_version_range": "<= 26.0.0"
}
}
],
"modified": "2021-04-30T17:30:42Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
}
],
"published": "2021-04-06T17:28:41Z",
"references": [
{
"url": "https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21391",
"type": "ADVISORY"
},
{
"url": "https://github.com/ckeditor/ckeditor5/releases/tag/v27.0.0",
"type": "WEB"
},
{
"url": "https://www.npmjs.com/package/@ckeditor/ckeditor5-engine",
"type": "WEB"
},
{
"url": "https://www.npmjs.com/package/@ckeditor/ckeditor5-font",
"type": "WEB"
},
{
"url": "https://www.npmjs.com/package/@ckeditor/ckeditor5-image",
"type": "WEB"
},
{
"url": "https://www.npmjs.com/package/@ckeditor/ckeditor5-list",
"type": "WEB"
},
{
"url": "https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm",
"type": "WEB"
},
{
"url": "https://www.npmjs.com/package/@ckeditor/ckeditor5-media-embed",
"type": "WEB"
},
{
"url": "https://www.npmjs.com/package/@ckeditor/ckeditor5-paste-from-office",
"type": "WEB"
},
{
"url": "https://www.npmjs.com/package/@ckeditor/ckeditor5-widget",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2021-04-29T01:15:00Z",
"github_reviewed_at": "2021-03-31T18:37:46Z"
}
}