Integer Overflow Vulnerability in libexpat Affects XML Parsing

CVE-2026-56411

What is CVE-2026-56411?

The libexpat library, specifically the xmlwf tool, contains a vulnerability that leads to an integer overflow during the processing of NOTATION declarations in endDoctypeDecl. This issue can have significant implications for applications that rely on libexpat for XML parsing, as it may result in unexpected behaviors or security risks. Users are encouraged to update to version 2.8.2 or later to mitigate this issue. For further technical details, refer to the GitHub pull request.

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