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CVE-2025-5991— Use after free in QHttp2ProtocolHandler

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是Qt开源的一个跨平台的应用程序开发框架。 Qt 6.9.0版本存在安全漏洞，该漏洞源于释放后重用，可能导致竞争条件。

CVSS 2.1 · Low EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
Qt Qt < 6.9.0 unaffected
6.9.0 affected
6.9.1 unaffected
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I. Basic Information for CVE-2025-5991

Vulnerability Information
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Vulnerability Title
Use after free in QHttp2ProtocolHandler
Source: CVE Program / CVE List V5
Vulnerability Description
There is a "Use After Free" vulnerability in Qt's QHttp2ProtocolHandler in the QtNetwork module. This only affects HTTP/2 handling, HTTP handling is not affected by this at all. This happens due to a race condition between how QHttp2Stream uploads the body of a POST request and the simultaneous handling of HTTP error responses. This issue only affects Qt 6.9.0 and has been fixed for Qt 6.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Qt 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Qt是Qt开源的一个跨平台的应用程序开发框架。 Qt 6.9.0版本存在安全漏洞，该漏洞源于释放后重用，可能导致竞争条件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Qt Qt 6.9.0 -

II. Public POCs for CVE-2025-5991

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III. Intelligence Information for CVE-2025-5991

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IV. Related Vulnerabilities

Same product: Qt
Same vendor: Qt
Same weakness: CWE-416

V. Comments for CVE-2025-5991

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