---
id: CVE-2025-3028
title: >-
  JavaScript code running while transforming a document with the XSLTProcessor
  could lead to a use-after-free
summary: >-
  JavaScript code running while transforming a document with the XSLTProcessor
  could lead to a use-after-free. This vulnerability was fixed in Firefox 137,
  Firefox ESR 115.22, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'
cwe:
  - CWE-416
vendor: mozilla
product: firefox
affected:
  - firefox < 115.22.0
  - firefox < 137.0
  - 'firefox >= 116.0, < 128.9.0'
  - thunderbird < 128.9.0
  - 'thunderbird >= 129.0, <= 137.0'
patched:
  - firefox 128.9.0
  - thunderbird 128.9.0
published: '2025-04-01'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T19:10:01.007'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-3028'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1941002'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-20/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-21/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-22/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-23/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-24/'
    label: security@mozilla.org
  - url: 'https://lists.debian.org/debian-lts-announce/2025/04/msg00005.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00855
epssPercentile: 0.56783
ingestedAt: '2026-09-30T19:21:07.231Z'
---

## Overview

JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-after-free. This vulnerability was fixed in Firefox 137, Firefox ESR 115.22, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.

## Affected

- `firefox < 115.22.0`
- `firefox < 137.0`
- `firefox >= 116.0, < 128.9.0`
- `thunderbird < 128.9.0`
- `thunderbird >= 129.0, <= 137.0`

## Remediation

Upgrade past the affected range:

- `firefox 128.9.0`
- `thunderbird 128.9.0`