CVE-2026-100140Integer overflow vulnerability in XML parsing functionality of Qt5Compat impacts Qt

Description

An integer overflow vulnerability in the Qt XML parsing (Qt5Compat / QXmlSimpleReader) functionality of Qt.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-100140: vendor-advisory
• https://codereview.qt-project.org/c/qt/qt5compat/+/768900 patch
• https://codereview.qt-project.org/c/qt/qt5compat/+/764751 patch
• https://codereview.qt-project.org/c/qt/qt5compat/+/768901 patch
• https://codereview.qt-project.org/c/qt/qt5compat/+/768902 patch