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.
Update to 0.5.0 (once it is released)
Downstream applications can validate the input and reject the maliciously crafted documents.
Similar to this one reported on the Go standard library:
If you have any questions or comments about this advisory:
xmldom/xmldom
npm owner ls xmldom
github.com/xmldom/xmldom
github.com/xmldom/xmldom/commit/d4201b9dfbf760049f457f9f08a3888d48835135
github.com/xmldom/xmldom/releases/tag/0.5.0
github.com/xmldom/xmldom/security/advisories/GHSA-h6q6-9hqw-rwfv
lists.debian.org/debian-lts-announce/2023/01/msg00000.html
nvd.nist.gov/vuln/detail/CVE-2021-21366
www.npmjs.com/package/xmldom