---
id: CVE-2026-83615
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 0.8.15
  and 0.9.12, and in xmldom versions 0.1.5 through 0.6.0, appendElement in
  lib/sax.js uses _c…
severity: high
cwe:
  - CWE-770
vendor: xmldom
product: '@xmldom/xmldom'
affected:
  - '@xmldom/xmldom >= 0.7.0, <= 0.8.14'
  - '@xmldom/xmldom >= 0.9.0, <= 0.9.11'
  - 'xmldom >= 0.1.5, <= 0.6.0'
patched:
  - '@xmldom/xmldom 0.8.15'
  - '@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-2026-83615'
references:
  - url: >-
      https://github.com/xmldom/xmldom/commit/954370f58c046223faf95ba77efcbc8ce014409d
    label: security-advisories@github.com
  - url: >-
      https://github.com/xmldom/xmldom/commit/dabffe884e864eeecb1f515c716f875e1bc47ec1
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/pull/1071'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/pull/1072'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/releases/tag/0.8.15'
    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-965w-775f-mr7g'
    label: security-advisories@github.com
  - url: 'https://github.com/xmldom/xmldom/security/advisories/GHSA-965w-775f-mr7g'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83615'
  - url: 'https://github.com/advisories/GHSA-965w-775f-mr7g'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83615.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-83615'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2526843'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-83615'
  - url: 'https://access.redhat.com/errata/RHSA-2026:69248'
tags:
  - nvd
  - ghsa
  - npm
  - csaf
  - vex
  - red-hat
aliases:
  - GHSA-965w-775f-mr7g
ecosystem: npm
epss: 0.0059
epssPercentile: 0.45926
ingestedAt: '2026-09-08T21:11:12.321Z'
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
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 0.8.15 and 0.9.12, and in xmldom versions 0.1.5 through 0.6.0, appendElement in lib/sax.js uses _copy to clone the complete currentNSMap for each nested element that declares a new namespace prefix. Keeping every ancestor map live on the parse stack creates quadratic peak namespace-map storage, so a small highly compressible XML document can exhaust the process heap before application validation. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

## Remediation

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

## Package advisory (CVE-2026-83615)

Affected packages:

- `@xmldom/xmldom >= 0.7.0, <= 0.8.14`
- `@xmldom/xmldom >= 0.9.0, <= 0.9.11`
- `xmldom >= 0.1.5, <= 0.6.0`

Patched in:

- `@xmldom/xmldom 0.8.15`
- `@xmldom/xmldom 0.9.12`

Source: https://github.com/advisories/GHSA-965w-775f-mr7g

## Vendor advisories

- **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 Build of Podman Desktop, Red Hat Fuse 7, 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-2026-83615.json)
- **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)