CVE-2026-105946

Out-of-bounds read in the QAuthenticator NTLM authentication handling in the Qt Network module in Qt Group Qt allows remote attackers to obtain sensitive information (heap memory contents) or cause a denial of service (application crash) via a crafted NTLM challenge sent by a malicious server or proxy, when an application using QNetworkAccessManager or QTcpSocket authenticates with NTLM.

CVSS 4.0

5.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

CWE

CWE-125

Published

2026-10-27

Modified

2026-10-27

Record from

the NVD, synced 2026-10-27

References

• https://codereview.qt-project.org/c/qt/qtbase/+/744448
• https://codereview.qt-project.org/c/qt/qtbase/+/745457
• https://codereview.qt-project.org/c/qt/qtbase/+/745464
• https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-105946:

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