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                            CERT-Renater

                Note d'Information No. 2025/VULN215

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DATE                : 08/04/2025

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache POI versions prior to
                                        5.4.0.

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https://lists.apache.org/thread/k14w8vcjqy4h34hh5kzldko78kpylkq5
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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


Severity: moderate

Affected versions:

- Apache POI before 5.4.0

Description:

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.

This issue is being tracked as bug-69620 


References:

https://bz.apache.org/bugzilla/show_bug.cgi?id=69620
https://poi.apache.org/
https://www.cve.org/CVERecord?id=CVE-2025-31672
https://issues.apache.org/jira/browse/bug-69620


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