---
id: CVE-2026-57233
title: Notepad++ is a free and open-source source code editor
summary: >-
  Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the
  WinGup decompress function joins untrusted ZIP entry names to unzipDestTo
  without canonical containment validation, allowing an entry such as
  ../mimeTools/mimeTo…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H'
cwe:
  - CWE-22
published: '2026-08-17'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:11:25.743'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-57233'
references:
  - url: 'https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7'
    label: security-advisories@github.com
  - url: >-
      https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-hjxw-84rf-wg5r
    label: security-advisories@github.com
  - url: >-
      https://github.com/notepad-plus-plus/wingup/commit/7670296a5c7fdec624e0a45dbde51059a7d735a8
    label: security-advisories@github.com
  - url: 'https://github.com/notepad-plus-plus/wingup/pull/106'
    label: security-advisories@github.com
  - url: >-
      https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-hjxw-84rf-wg5r
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00509
epssPercentile: 0.40952
ingestedAt: '2026-09-09T21:22:45.535Z'
---

## Overview

Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the WinGup decompress function joins untrusted ZIP entry names to unzipDestTo without canonical containment validation, allowing an entry such as ../mimeTools/mimeTools.dll to overwrite a DLL in a sibling plugin directory and execute attacker-controlled code when Notepad++ next loads that plugin. This issue is fixed in version 8.9.7.

## Remediation

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