Reachable assertion in Trolltech Qt

1) Reachable assertion

EUVDB-ID: #VU112077

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-5455

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due to a reachable assertion within the qDecodeDataUrl() function in QtCore. A remote attacker can pass a specially crafted data, such as URL with a "charset" parameter but without a value, and crash the application. 

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Qt: 5.0 - 6.9.0

CPE2.3

• cpe:2.3:a:trolltech:qt:5.0:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.1:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.2:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:trolltech:qt:5.2.1:*:*:*:*:*:*:*

External links

https://codereview.qt-project.org/c/qt/qtbase/+/642006
https://www.qt.io/blog/security-advisory-recently-discovered-issue-in-qdecodedataurl-in-qtcore-impacts-qt
https://codereview.qt-project.org/c/qt/qtbase/+/642434
https://codereview.qt-project.org/c/qt/tqtc-qtbase/+/642469
https://codereview.qt-project.org/c/qt/tqtc-qtbase/+/642734
https://codereview.qt-project.org/c/qt/tqtc-qtbase/+/643952

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.