CVE-2026-105946

Out-of-bounds read vulnerability in NTLM authentication handling impacts Qt

State: Published
Severity: 5.3 Medium
Published: Oct 27, 2026
Updated: Oct 27, 2026
Reserved: Oct 6, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS: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	Qt

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
qtqt	before 6.8.0Unknown 6.8.0 to before 6.8.10Affected 6.9.0 to before 6.11.2Affected

References

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