Description
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In @xmldom/xmldom prior to versions 0.9.10 and 0.8.13 and xmldom version 0.6.0 and prior, the package serializes DocumentType node fields (internalSubset, publicId, systemId) verbatim without any escaping or validation. When these fields are set programmatically to attacker-controlled strings, XMLSerializer.serializeToString can produce output where the DOCTYPE declaration is terminated early and arbitrary markup appears outside it. This issue has been patched in versions @xmldom/xmldom versions 0.9.10 and 0.8.13.
References10
- github.com/xmldom/xmldom/commit/372008f9ae0e20fd69f761c7b79e202…
- github.com/xmldom/xmldom/releases/tag/0.8.13
- github.com/xmldom/xmldom/releases/tag/0.9.10
- github.com/xmldom/xmldom/security/advisories/GHSA-f6ww-3ggp-fr8h
- access.redhat.com/errata/RHSA-2026:20034
- access.redhat.com/errata/RHSA-2026:21338
- access.redhat.com/errata/RHSA-2026:21703
- access.redhat.com/errata/RHSA-2026:26234
- access.redhat.com/security/cve/CVE-2026-41674
- bugzilla.redhat.com/show_bug.cgi?id=2467620
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 4.0
-
8.7
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 48 · as of 13 November 2026
- CWE
- CWE-91
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.