CVE-2025-31672: Apache POI: parsing OOXML based files (xlsx, docx, etc.), poi-ooxml could read unexpected data if underlying zip has duplicate zip entry names
First published: Tue Apr 08 2025(Updated: )
Improper Input Validation vulnerability in Apache POI. The issue affects the parsing of OOXML format files like xlsx, docx and pptx. These file formats are basically zip files and it is possible for malicious users to add zip entries with duplicate names (including the path) in the zip. In this case, products reading the affected file could read different data because 1 of the zip entries with the duplicate name is selected over another but different products may choose a different zip entry. This issue affects Apache POI poi-ooxml before 5.4.0. poi-ooxml 5.4.0 has a check that throws an exception if zip entries with duplicate file names are found in the input file. Users are recommended to upgrade to version poi-ooxml 5.4.0, which fixes the issue. Please read https://poi.apache.org/security.html for recommendations about how to use the POI libraries securely.
Credit: security@apache.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Apache POI | <5.4.0 | |
| Apache POI | <5.4.0 | |
| maven/org.apache.poi:poi-ooxml | <5.4.0 | 5.4.0 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-31672?
CVE-2025-31672 is classified as a medium severity vulnerability due to improper input validation in Apache POI.
How do I fix CVE-2025-31672?
To fix CVE-2025-31672, upgrade to Apache POI version 5.4.0 or later.
What file formats are affected by CVE-2025-31672?
CVE-2025-31672 affects the parsing of OOXML format files including xlsx, docx, and pptx.
Who is impacted by CVE-2025-31672?
Users of Apache POI versions prior to 5.4.0 are impacted by CVE-2025-31672.
What type of vulnerability is CVE-2025-31672?
CVE-2025-31672 is an improper input validation vulnerability.
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