CVE-2026-65829
Received Received - Intake

Arbitrary File Write in MPXJ via Malicious PRX or STX File

Publication date: 2026-09-22

Last updated on: 2026-09-22

Assigner: GitHub, Inc.

Description
MPXJ is an open source library to read and write project plans from a variety of file formats and databases. From 7.3.0 until 16.5.0, reading a suitably crafted Primavera P3 PRX or SureTrak STX file can cause MPXJ to write files to arbitrary locations in the filesystem. This issue is fixed in version 16.5.0.

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Meta Information

Published
2026-09-22
Last Modified
2026-09-22
Generated
2026-09-23
AI Q&A
2026-09-22
EPSS Evaluated
N/A
NVD
CVE-2026-65829
EUVD
EUVD-2026-84819

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mpxj mpxj From 7.3.0 (inc) to 16.5.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

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Executive Summary

This vulnerability is a Path Traversal issue in the MPXJ library affecting versions 7.3.0 to 16.4.0. It allows attackers to write files to arbitrary locations on the filesystem by processing maliciously crafted Primavera P3 PRX or SureTrak STX files.

Detection Guidance

Detecting this vulnerability requires checking if your system uses MPXJ versions between 7.3.0 and 16.4.0 and if it processes Primavera P3 PRX or SureTrak STX files from untrusted sources. Review file access logs for unexpected writes outside intended directories when handling these file types.

Impact Analysis

An attacker could overwrite critical system files, plant malware, or access sensitive data by tricking a user or application into processing a malicious PRX or STX file. This could lead to system compromise or data breaches.

Compliance Impact

This vulnerability could lead to unauthorized file access or modification, potentially violating data protection requirements under GDPR or HIPAA. Organizations may face compliance penalties if exploited.

Mitigation Strategies
  • Upgrade MPXJ to version 16.5.0 or later to address the vulnerability.
  • Avoid processing PRX or STX files from untrusted sources as a temporary workaround.
  • Monitor file system access for suspicious activity related to MPXJ operations.

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