Is CVE-2026-105946 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-105946 being exploited in the wild.

How severe is CVE-2026-105946?

Informational severity, published 27 October 2026.

Is there a fix for CVE-2026-105946?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-105946 attacked?

It is attacked over the network or from the adjacent network, in a software library.

Am I affected by CVE-2026-105946?

Check whether you run Qt Group Qt at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-105946: Qt Network QAuthenticator NTLM out-of-bounds read

CVE-2026-105946 · Severity: info · Published 2026-10-27

Qt Network, used by desktop and embedded applications for network communication, contains a flaw in NTLM authentication handling. When an application connects to a server or proxy and authenticates using NTLM, a malicious server can send a crafted challenge that triggers an out-of-bounds memory read, potentially exposing sensitive data from heap memory or crashing the application.

Technologies: Qt Group Qt. Vendors: Qt Group.

Quick answers

Is CVE-2026-105946 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-105946 being exploited in the wild.
How severe is CVE-2026-105946?: Informational severity, published 27 October 2026.
Which products and versions are affected?: Qt Group Qt <UNKNOWN>.
Is there a fix for CVE-2026-105946?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-105946 attacked?: It is attacked over the network or from the adjacent network, in a software library.
Am I affected by CVE-2026-105946?: Check whether you run Qt Group Qt at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The QAuthenticator component in Qt Network fails to properly validate NTLM challenge messages, leading to an out-of-bounds read in memory when processing the response. The vulnerability affects applications using QNetworkAccessManager or QTcpSocket for NTLM authentication. An attacker controlling or intercepting a server or proxy can exploit this by sending a malicious NTLM challenge to leak heap memory or cause denial of service.

Affected products

Qt Group Qt <UNKNOWN>

Timeline

2026-10-27: disclosed

References

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