Out-of-Bounds Read Vulnerability in QAuthenticator by Qt Group
CVE-2026-105946

5.3MEDIUM

Key Information:

Vendor

Qt

Status
Qt
Vendor
CVE Published:
27 October 2026

What is CVE-2026-105946?

An out-of-bounds read vulnerability exists in the NTLM authentication handling of QAuthenticator within the Qt Network module. This flaw allows remote attackers to exploit crafted NTLM challenges from malicious servers or proxies, potentially leading to disclosure of sensitive information, including heap memory contents, or causing application crashes. It affects any application utilizing QNetworkAccessManager or QTcpSocket for NTLM authentication.

Affected Version(s)

qt 6.8.0 < 6.8.10

qt 6.9.0 < 6.11.2

References

https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_pr...
vendor-advisory
https://codereview.qt-project.org/c/qt/qtbase/+/745457
patch
https://codereview.qt-project.org/c/qt/qtbase/+/744448
patch

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.