Medium severity4.3NVD Advisory· Published Mar 12, 2021· Updated Jun 17, 2026
CVE-2021-21366
CVE-2021-21366
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
xmldomnpm | < 0.5.0 | 0.5.0 |
Affected products
5- osv-coords2 versions
< 4.14.6-r3+ 1 more
- (no CPE)range: < 4.14.6-r3
- (no CPE)range: < 0.5.0
Patches
Vulnerability mechanics
References
7- github.com/xmldom/xmldom/commit/d4201b9dfbf760049f457f9f08a3888d48835135nvdPatchWEB
- github.com/advisories/GHSA-h6q6-9hqw-rwfvghsaADVISORY
- github.com/xmldom/xmldom/security/advisories/GHSA-h6q6-9hqw-rwfvnvdVendor AdvisoryWEB
- lists.debian.org/debian-lts-announce/2023/01/msg00000.htmlnvdMailing ListThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2021-21366ghsaADVISORY
- github.com/xmldom/xmldom/releases/tag/0.5.0nvdRelease NotesWEB
- www.npmjs.com/package/xmldomnvdProductWEB
News mentions
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