Medium 5.3Published Oct 27, 2026

CVE-2026-105946Out-of-bounds read vulnerability in NTLM authentication handling impacts Qt

Updated under an hour ago (Oct 29, 2026, 2:40 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 5.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Qt
NVD analysis: Awaiting Analysis
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 27, 2026

Affected products

Affected products

qt qt qt:qt	before 6.8.0 status unknown; from 6.8.0 before 6.8.10; from 6.9.0 before 6.11.2	CNA record
qt qt qt:qtbase	before 6.8.0 status unknown; from 6.8.0 before 6.8.10; from 6.9.0 before 6.11.2	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.