---
id: CVE-2026-83607
title: >-
  xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core)
  DOMParser and XMLSerializer module
summary: >-
  xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core)
  DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14
  and 0.9.11, and in xmldom version 0.6.0 and earlier,
  Document.createElement(tagName) stores…
severity: high
cwe:
  - CWE-91
  - CWE-79
vendor: xmldom
product: '@xmldom/xmldom'
affected:
  - '@xmldom/xmldom >= 0.9.0, <= 0.9.10'
  - '@xmldom/xmldom >= 0.7.0, <= 0.8.13'
  - xmldom <= 0.6.0
patched:
  - '@xmldom/xmldom 0.9.11'
  - '@xmldom/xmldom 0.8.14'
published: '2026-09-01'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:11:31.703'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83607'
references:
  - url: >-
      https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e
    label: security-advisories@github.com
  - url: >-
      https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/pull/1043'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/pull/1050'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/releases/tag/0.8.14'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/releases/tag/0.9.11'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/security/advisories/GHSA-w2rr-34g9-rvrj'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/security/advisories/GHSA-w2rr-34g9-rvrj'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83607'
  - url: 'https://github.com/advisories/GHSA-w2rr-34g9-rvrj'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83607.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-83607'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2526817'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-83607'
  - url: 'https://access.redhat.com/errata/RHSA-2026:69248'
tags:
  - nvd
  - ghsa
  - npm
  - csaf
  - vex
  - red-hat
epss: 0.00348
epssPercentile: 0.28443
aliases:
  - GHSA-w2rr-34g9-rvrj
ecosystem: npm
ingestedAt: '2026-09-08T21:11:12.322Z'
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N'
cvssSource: vendor
---

## Overview

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Document.createElement(tagName) stores an unvalidated element name and XMLSerializer.serializeToString() emits that name verbatim. The requireWellFormed: true path did not validate the element qualified name or synthesized xmlns:PREFIX declaration, so attacker-controlled tag names could inject attributes, elements, or processing instructions into serialized XML or HTML and could cause cross-site scripting when browser-consumed. The unchecked values violate the XML QName constraint, and default serialization and creation-time createElement() behavior remain permissive. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-83607)

Affected packages:

- `@xmldom/xmldom >= 0.9.0, <= 0.9.10`
- `@xmldom/xmldom >= 0.7.0, <= 0.8.13`
- `xmldom <= 0.6.0`

Patched in:

- `@xmldom/xmldom 0.9.11`
- `@xmldom/xmldom 0.8.14`

Source: https://github.com/advisories/GHSA-w2rr-34g9-rvrj

## Vendor advisories

- **RHSA-2026:69248** · Red Hat · fixed in: Red Hat Developer Hub 1.9 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69248)
- **Red Hat VEX** · Important · affected: Red Hat Build of Podman Desktop, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat Fuse 7, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Fuse 7, Red Hat Build of Podman Desktop, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83607.json)