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High, CVSS 7.4amended

IzPack has Path Traversal in UnpackerBase that allows writing files outside the installation directory via malicious pack entries

CVE-2026-54550GHSA-f63g-88cj-hjf9

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.codehaus.izpack:izpack-installer 5.2.7), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.4 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
EPSS
  • CVE-2026-54550: 0.45% estimated exploitation activity in the next 30 days; percentile 39.31 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary IzPack's `UnpackerBase.unpack()` resolves pack-file target paths without any canonical-path or directory-containment check. An attacker who distributes a trojanized installer JAR (the format is unsigned) can include pack entries whose `targetPath` contains `../` sequences. When a victim runs the installer the file is written to an attacker-chosen location on disk under the victim's privileges — including startup folders, PATH directories, or system locations.

Details Vulnerable method: `com.izforge.izpack.installer.unpacker.UnpackerBase.unpack()` Source file: `izpack-installer/src/main/java/com/izforge/izpack/installer/unpacker/UnpackerBase.java` Vulnerable lines (5.2.4): ~618–627 The relevant code path is: ```java String targetPath = packFile.getTargetPath(); // attacker-controlled String path = IoHelper.translatePath(targetPath, variables); // separator swap ONLY File target = new File(path); // no canonical check // ... mkdirs() then file is written to…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from osv record GHSA-f63g-88cj-hjf9

  2. Revision 3 · amended ·

    Amended from ghsa record GHSA-f63g-88cj-hjf9

  3. Revision 2 · amended ·

    Amended from ghsa record GHSA-f63g-88cj-hjf9

  4. Revision 1 · created ·

    Published from osv record GHSA-f63g-88cj-hjf9

Agent brief

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# Patch Next advisory brief: CVE-2026-54550

Advisory: IzPack has Path Traversal in UnpackerBase that allows writing files outside the installation directory via malicious pack entries
IDs: CVE-2026-54550, GHSA-f63g-88cj-hjf9
Record: https://patchnext.com/advisories/cve-2026-54550 (revision 4, source checked 28 Oct 2026, 06:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.codehaus.izpack:izpack-installer 5.2.7. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.codehaus.izpack:izpack-installer: affected < 5.2.7; fixed in 5.2.7

## Suggested inspection (read-only)
- Maven org.codehaus.izpack:izpack-installer: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.codehaus.izpack:izpack-installer.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-f63g-88cj-hjf9 (OSV record GHSA-f63g-88cj-hjf9 lists affected ranges: Maven org.codehaus.izpack:izpack-installer >=0 <=5.2.6)
- Verified: https://github.com/advisories/GHSA-f63g-88cj-hjf9 (GitHub-reviewed advisory GHSA-f63g-88cj-hjf9 lists affected ranges: Maven org.codehaus.izpack:izpack-installer >=0 <=5.2.6)
- Verified: https://github.com/advisories/GHSA-f63g-88cj-hjf9 (GitHub-reviewed advisory GHSA-f63g-88cj-hjf9 lists affected ranges: Maven org.codehaus.izpack:izpack-installer >=0 <5.2.7)
- Verified: https://osv.dev/vulnerability/GHSA-f63g-88cj-hjf9 (OSV record GHSA-f63g-88cj-hjf9 lists affected ranges: Maven org.codehaus.izpack:izpack-installer >=0 <5.2.7 (fixed))

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