Denial of service in Trolltech Qt



| Updated: 2025-07-01
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-5991
CWE-ID CWE-416
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Qt
Universal components / Libraries / Scripting languages

Vendor Trolltech

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU112058

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-5991

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error within the QHttp2ProtocolHandler in the QtNetwork module. A remote attacker can trigger a race condition between QHttp2Stream HTTP POST uploads and simultaneous handling of HTTP error responses and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Qt: 6.9.0

CPE2.3 External links

https://codereview.qt-project.org/c/qt/qtbase/+/643777
https://www.qt.io/blog/security-advisory-recently-discovered-use-after-free-issue-in-qhttp2protocolhandler-impacts-qt


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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