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Advisory record · GHSA-5vvx-3h34-f3gj

MPXJ: XXE Vulnerability in MerlinReader

CVSS 7.5 HighEPSS 0.0047 · 41st percentile

Published by the GitHub Advisory Database at 22 Sept 2026, 20:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
net.sf.mpxj:mpxjMaven>=5.5.5, <16.4.116.4.1
mpxjRubyGems>=5.5.5, <16.4.116.4.1
MPXJ.NetNuGet>=5.5.5, <16.4.116.4.1
net.sf.mpxjNuGet>=5.5.5, <16.4.116.4.1
net.sf.mpxj-for-csharpNuGet>=5.5.5, <16.4.116.4.1
net.sf.mpxj-for-vbNuGet>=5.5.5, <16.4.116.4.1
mpxjPyPI>=5.5.5, <16.4.116.4.1
Identifiers
GHSA-5vvx-3h34-f3gj · CVE-2026-61570 · PYSEC-2026-4107
Weakness (CWE)
CWE-611
Tags
Published
22 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

MPXJ versions from 5.5.5 before 16.4.1 are vulnerable to an XML external entity (XXE) flaw in the MerlinReader component, which parses XML from the ZTIMEINTERVALS column of Merlin project SQLite files. An attacker who supplies a crafted Merlin project file can read arbitrary files, though the source says the parsed data is unlikely to be available for exfiltration. Upgrade to version 16.4.1 or later, or only open Merlin project files from trusted sources.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0047, the 41st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.