---
id: CVE-2026-83618
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. From 0.9.10 until 0.9.12, the
  requireWellFormed: true serializer validates DocumentType.publicId and
  DocumentType.systemId with Pub…
severity: high
cwe:
  - CWE-91
  - CWE-625
vendor: xmldom
product: '@xmldom/xmldom'
affected:
  - '@xmldom/xmldom >= 0.9.10, <= 0.9.11'
patched:
  - '@xmldom/xmldom 0.9.12'
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-2026-83618'
references:
  - url: >-
      https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/pull/1071'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/releases/tag/0.9.12'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/security/advisories/GHSA-vr34-hp96-76pp'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/security/advisories/GHSA-vr34-hp96-76pp'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83618'
  - url: 'https://github.com/advisories/GHSA-vr34-hp96-76pp'
tags:
  - nvd
  - ghsa
  - npm
aliases:
  - GHSA-vr34-hp96-76pp
ecosystem: npm
epss: 0.0057
epssPercentile: 0.44841
ingestedAt: '2026-09-08T21:11:12.320Z'
---

## Overview

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.10 until 0.9.12, the requireWellFormed: true serializer validates DocumentType.publicId and DocumentType.systemId with PubidLiteral_match and SystemLiteral_match expressions produced by reg() in lib/grammar.js, which inherit the multiline flag. A complete valid literal on the first line can therefore satisfy the matcher while U+000A, U+000D, U+2028, or U+2029 and breakout markup remain in the emitted <!DOCTYPE ...> declaration. This bypasses the strict-serialization mitigation for the earlier DocumentType injection advisory; creation and direct property assignment remain unvalidated by design. This issue is fixed in @xmldom/xmldom version 0.9.12.

## Remediation

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

## Package advisory (CVE-2026-83618)

Affected packages:

- `@xmldom/xmldom >= 0.9.10, <= 0.9.11`

Patched in:

- `@xmldom/xmldom 0.9.12`

Source: https://github.com/advisories/GHSA-vr34-hp96-76pp