---
id: CVE-2026-54550
title: >-
  IzPack is a widely used tool for packaging applications on the Java platform
  as cross-platform installers
summary: >-
  IzPack is a widely used tool for packaging applications on the Java platform
  as cross-platform installers. In 5.2.6 and earlier, UnpackerBase.unpack() in
  izpack-installer/src/main/java/com/izforge/izpack/installer/unpacker/UnpackerBase.j…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N'
cwe:
  - CWE-22
vendor: codehaus
product: 'org.codehaus.izpack:izpack-installer'
affected:
  - 'org.codehaus.izpack:izpack-installer <= 5.2.6'
published: '2026-08-26'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54550'
references:
  - url: >-
      https://github.com/izpack/izpack/commit/4233ba38d0f1825f9cf3e0204e5261a5498e29d8
    label: security-advisories@github.com
  - url: >-
      https://github.com/izpack/izpack/commit/8b7c6792c4fe85e3b1759c106aae39b904848466
    label: security-advisories@github.com
  - url: 'https://github.com/izpack/izpack/pull/1193'
    label: security-advisories@github.com
  - url: 'https://github.com/izpack/izpack/security/advisories/GHSA-f63g-88cj-hjf9'
    label: security-advisories@github.com
  - url: 'https://github.com/izpack/izpack/security/advisories/GHSA-f63g-88cj-hjf9'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-f63g-88cj-hjf9'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00452
epssPercentile: 0.36546
aliases:
  - GHSA-f63g-88cj-hjf9
ecosystem: maven
ingestedAt: '2026-08-26T14:45:08.330Z'
---

## Overview

IzPack is a widely used tool for packaging applications on the Java platform as cross-platform installers. In 5.2.6 and earlier, UnpackerBase.unpack() in izpack-installer/src/main/java/com/izforge/izpack/installer/unpacker/UnpackerBase.java obtains an attacker-controlled PackFile targetPath, passes it through IoHelper.translatePath(), which only converts separators, and constructs a File without normalizing parent-directory segments or enforcing destination containment. A malicious installer pack entry containing ../ sequences can therefore write outside the intended installation directory to startup folders, executable search paths, or other locations accessible with the victim's privileges when the victim runs the installer.

## Remediation

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

## Package advisory (CVE-2026-54550)

Affected packages:

- `org.codehaus.izpack:izpack-installer <= 5.2.6`

Source: https://github.com/advisories/GHSA-f63g-88cj-hjf9