---
id: CVE-2026-101025
title: >-
  Description



  NGINX JavaScript (njs) has a vulnerability where the built-in njs engine leaks
  a libxml2 parser context when xml.parse() fails
summary: >-
  Description



  NGINX JavaScript (njs) has a vulnerability where the built-in njs engine leaks
  a libxml2 parser context when xml.parse() fails. The failure path did not
  register cleanup and the context was not released for the lifetime of …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-401
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T16:04:11.750'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101025'
references:
  - url: 'https://my.f5.com/manage/s/article/K000162614'
    label: f5sirt@f5.com
tags:
  - nvd
ingestedAt: '2026-10-14T15:36:13.995Z'
---

## Overview

Description


NGINX JavaScript (njs) has a vulnerability where the built-in njs engine leaks a libxml2 parser context when xml.parse() fails. The failure path did not register cleanup and the context was not released for the lifetime of the process. An unauthenticated attacker may send requests with malformed XML and can cause unbounded memory growth in long-lived NGINX worker processes.

Impact


This vulnerability may allow remote attackers to send requests that trigger repeated parsing of malformed XML and may lead to NGINX worker termination or denial of service. There is no control plane exposure; this is a data plane issue only.



 Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

## Remediation

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