CVE-2021-21366

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. xmldom versions 0.4.0 and older do not correctly preserve system identifiers, FPIs or namespaces when repeatedly parsing and serializing maliciously crafted documents. This may lead to unexpected syntactic changes during XML processing in some downstream applications. This is fixed in version 0.5.0. As a workaround downstream applications can validate the input and reject the maliciously crafted documents.

• CWE-115
• CWE-436
• CWE-436

• https://github.com/xmldom/xmldom/commit/d4201b9dfbf760049f457f9f08a3888d48835135Patch
• https://github.com/xmldom/xmldom/releases/tag/0.5.0Release Notes
• https://github.com/xmldom/xmldom/security/advisories/GHSA-h6q6-9hqw-rwfvVendor Advisory
• https://lists.debian.org/debian-lts-announce/2023/01/msg00000.htmlMailing List, Third Party Advisory
• https://www.npmjs.com/package/xmldomProduct
• https://github.com/xmldom/xmldom/commit/d4201b9dfbf760049f457f9f08a3888d48835135Patch
• https://github.com/xmldom/xmldom/releases/tag/0.5.0Release Notes
• https://github.com/xmldom/xmldom/security/advisories/GHSA-h6q6-9hqw-rwfvVendor Advisory
• https://lists.debian.org/debian-lts-announce/2023/01/msg00000.htmlMailing List, Third Party Advisory
• https://www.npmjs.com/package/xmldomProduct

Published

Mar 12, 2021

Last Modified

Jun 17, 2026

Status

Modified

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