Vulnerability in qt

[ Description ]Official description

An attacker able to supply a crafted XML document to an application using QXmlStreamReader can cause disproportionate CPU consumption during parsing, making the application unresponsive (denial of service). Exploitation requires only that the application parse attacker-influenced XML; no authentication, privileges, or user interaction beyond ingesting the input are needed. There is no loss of confidentiality or integrity — no data disclosure, data modification, or code execution — and the impact is contained to the affected process.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund22 Oct 2026WID-SEC-2026-4122

  Qt Core QXmlStream parser: Vulnerability allows denial of service Translated from German

  Risk mediumCVE-2026-16762

[ References ]References

• codereview.qt-project.org/c/qt/qtbase/+/738885
• codereview.qt-project.org/c/qt/qtbase/+/738901
• wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products