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

Quick assessment

Affected

qt qt

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Qt Group 的 Qt 框架中，Qt Network 模块的 QAuthenticator 在处理 NTLM 认证时存在越界读取漏洞。当使用 QNetworkAccessManager 或 QTcpSocket 的应用程序通过 NTLM 进行身份验证时，攻击者可通过恶意服务器或代理发送特制的 NTLM 挑战（challenge），从而远程获取敏感信息（如堆内存内容），或导致服务拒绝（应用程序崩溃）。

CVSS 5.3 · Medium Updated Oct 27, 2026

Possible ATT&CK Techniques 2 AI

T1069 · Permission Groups Discovery T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存读

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
qt	qt	6.8.0 ~ 6.8.10	`cpe:2.3:a:qt:qt::::::::`

II. Public POCs for CVE-2026-105946

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-105946

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Other References for CVE-2026-105946 (4)

https://www.cve.org/CVERecord?id=CVE-2026-105946

IV. Related Vulnerabilities

Same product: qt

Same vendor: qt

Same weakness: CWE-125