---
id: CVE-2026-73569
title: >-
  fast-xml-parser allows users to process XML from JS object without C/C++ based
  libraries or callbacks
summary: >-
  fast-xml-parser allows users to process XML from JS object without C/C++ based
  libraries or callbacks. From 5.9.3 until 5.10.1,
  src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations
  within a single XML document and pa…
severity: high
cwe:
  - CWE-776
published: '2026-08-13'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73569'
references:
  - url: >-
      https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f
    label: security-advisories@github.com
  - url: >-
      https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.10.1
    label: security-advisories@github.com
  - url: >-
      https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73569.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-73569'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2515526'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-73569'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73569'
  - url: 'https://access.redhat.com/errata/RHSA-2026:66003'
  - url: 'https://access.redhat.com/errata/RHSA-2026:67724'
  - url: 'https://access.redhat.com/errata/RHSA-2026:65130'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00507
epssPercentile: 0.4071
ingestedAt: '2026-09-18T20:51:25.607Z'
vendor: Red Hat
product: Red Hat Openshift Data Foundation 4.22
affected:
  - openshift_gitops
  - ansible_automation_platform 2.2
  - migration_toolkit_for_applications 8.2
  - openshift_data_foundation 4.22
patched:
  - ansible_automation_platform 2.2
  - migration_toolkit_for_applications 8.2
  - openshift_data_foundation 4.22
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

fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From 5.9.3 until 5.10.1, src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations within a single XML document and passes each declaration's entities through addInputEntities(). addInputEntities() resets maxTotalExpansions and maxExpandedLength every time it is called, allowing additional DOCTYPE declarations to repeatedly reset the configured entity-expansion limits during one parse operation. A crafted XML document can then cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination. This issue is fixed in version 5.10.1.

## Remediation

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

## Vendor advisories

- **RHSA-2026:66003** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:66003)
- **RHSA-2026:67724** · Red Hat · fixed in: Red Hat Migration Toolkit for Applications 8.2 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:67724)
- **RHSA-2026:65130** · Red Hat · fixed in: Red Hat Openshift Data Foundation 4.22 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65130)
- **Red Hat VEX** · Important · affected: Red Hat OpenShift GitOps · no fix planned: Red Hat OpenShift GitOps · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73569.json)