CVE-2026-24515
Modified Modified - Updated After Analysis
BaseFortify

Publication date: 2026-01-23

Last updated on: 2026-06-02

Assigner: MITRE

Description
In libexpat before 2.7.4, XML_ExternalEntityParserCreate does not copy unknown encoding handler user data.
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Meta Information
Published
2026-01-23
Last Modified
2026-06-02
Generated
2026-06-16
AI Q&A
2026-01-23
EPSS Evaluated
2026-06-15
NVD
CVE-2026-24515
EUVD
EUVD-2026-4424
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
libexpat_project libexpat to 2.7.4 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability in libexpat before version 2.7.4 involves the function XML_ExternalEntityParserCreate not properly copying the user data associated with unknown encoding handlers. This improper handling could lead to incorrect use or handling of that user data, potentially affecting the security or stability of applications that use libexpat for XML parsing. The issue was fixed by ensuring the function correctly copies this user data. [1]

Impact Analysis

The vulnerability could impact you by causing incorrect handling or misuse of user data related to unknown encoding handlers in XML parsing. This might lead to security or stability issues in applications relying on libexpat, such as unexpected behavior or potential exploitation due to improper data handling during external entity parsing. [1]

Mitigation Strategies

To mitigate this vulnerability, you should update libexpat to version 2.7.4 or later, where the issue with XML_ExternalEntityParserCreate not copying unknown encoding handler user data has been fixed. Applying this update ensures proper handling of user data for unknown encoding handlers and mitigates the security risk. [1]

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