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

Quick assessment

Affected
izpack izpack
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IzPack是IzPack组织的一款软件安装包制作工具。 IzPack 5.2.6及之前版本存在路径遍历漏洞，该漏洞源于UnpackerBase.unpack()方法在处理恶意安装包条目时未对路径进行规范化处理，攻击者可通过包含../序列的条目将文件写入预期安装目录之外的位置。

CVSS 7.4 · High EPSS 0.45% · P38

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
izpack izpack <= 5.2.6 affected
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I. Basic Information for CVE-2026-54550

Vulnerability Information
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Vulnerability Title
IzPack: Path Traversal in UnpackerBase allows writing files outside the installation directory via malicious pack entries
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
IzPack 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IzPack是IzPack组织的一款软件安装包制作工具。 IzPack 5.2.6及之前版本存在路径遍历漏洞，该漏洞源于UnpackerBase.unpack()方法在处理恶意安装包条目时未对路径进行规范化处理，攻击者可通过包含../序列的条目将文件写入预期安装目录之外的位置。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
izpack izpack <= 5.2.6 -

II. Public POCs for CVE-2026-54550

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 2417 chars
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III. Intelligence Information for CVE-2026-54550

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Patches & Fixes for CVE-2026-54550 (3)

Vendor Advisories for CVE-2026-54550 (1)

IV. Related Vulnerabilities

Same weakness: CWE-22

V. Comments for CVE-2026-54550

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