---
id: CVE-2026-34601
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. In xmldom versions 0.6.0 and prior and
  @xmldom/xmldom prior to versions 0.8.12 and 0.9.9, xmldom/xmldom allows
  attacker-control…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-91
  - CWE-91
published: '2026-04-02'
updated: '2026-07-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34601'
references:
  - url: >-
      https://github.com/xmldom/xmldom/commit/2b852e836ab86dbbd6cbaf0537f584dd0b5ac184
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/releases/tag/0.8.12'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/releases/tag/0.9.9'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp'
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-34601'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2454595'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34601.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00472
epssPercentile: 0.3997
ingestedAt: '2026-07-21T19:53:39.447Z'
---

## Overview

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In xmldom versions 0.6.0 and prior and @xmldom/xmldom prior to versions 0.8.12 and 0.9.9, xmldom/xmldom allows attacker-controlled strings containing the CDATA terminator ]]> to be inserted into a CDATASection node. During serialization, XMLSerializer emitted the CDATA content verbatim without rejecting or safely splitting the terminator. As a result, data intended to remain text-only became active XML markup in the serialized output, enabling XML structure injection and downstream business-logic manipulation. This issue has been patched in xmldom version 0.6.0 and @xmldom/xmldom versions 0.8.12 and 0.9.9.

## Remediation

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