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

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

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

## Remediation

No remediation reported in collected sources

## Affected products and versions

- qt / qt: ≥ 6.0.0; ≤ 6.8.9 (affected, python); ≥ 6.9.0; ≤ 6.11.2 (affected, python); 6.12.0 (affected, python). Source: CNA: Qt

## Severity and prioritization

- CVSS 4.0: 1.9 (low); CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/R:U/U:Green; source: CNA: Qt

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-190

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-100140: (CNA: Qt; vendor-advisory)

- https://codereview.qt-project.org/c/qt/qt5compat/+/768900 (CNA: Qt; patch)

- https://codereview.qt-project.org/c/qt/qt5compat/+/764751 (CNA: Qt; patch)

- https://codereview.qt-project.org/c/qt/qt5compat/+/768901 (CNA: Qt; patch)

- https://codereview.qt-project.org/c/qt/qt5compat/+/768902 (CNA: Qt; patch)

## Provenance

- CNA: Qt: https://www.cve.org/CVERecord?id=CVE-2026-100140; retrieved 2026-11-02; source updated 2026-11-02

Revision: aa18d6a7461947c93d626e5f6f1fbabd4716135d0bd03a0e7dd31fc61ede20d0

Canonical: https://y2.dev/cve/CVE-2026-100140