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Medium, CVSS 4.2

XML External Entity Reference in Eclipse Lyo

CVE-2021-41042GHSA-6296-mvgp-27hp

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.eclipse.lyo:lyo-parent 5.0.0.Final), 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
4.2 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
EPSS
  • CVE-2021-41042: 1.00% estimated exploitation activity in the next 30 days; percentile 62.94 (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.

In Eclipse Lyo versions 1.0.0 to 4.1.0, a TransformerFactory is initialized with the defaults that do not restrict DTD loading when working with RDF/XML. This allows an attacker to cause an external DTD to be retrieved.

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

    Published from ghsa record GHSA-6296-mvgp-27hp

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2021-41042

Advisory: XML External Entity Reference in Eclipse Lyo
IDs: CVE-2021-41042, GHSA-6296-mvgp-27hp
Record: https://patchnext.com/advisories/cve-2021-41042 (revision 1, source checked 26 Oct 2026, 16:01 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.eclipse.lyo:lyo-parent 5.0.0.Final. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.eclipse.lyo:lyo-parent: affected >= 1.0.0, <= 4.1.0; fixed in 5.0.0.Final

## Suggested inspection (read-only)
- Maven org.eclipse.lyo:lyo-parent: 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.eclipse.lyo:lyo-parent.
- 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://github.com/advisories/GHSA-6296-mvgp-27hp (GitHub-reviewed advisory GHSA-6296-mvgp-27hp lists affected ranges: Maven org.eclipse.lyo:lyo-parent >=1.0.0 <=4.1.0)

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