CVE-2025-5455

Possible denial of service when passing malformed data in a URL to qDecodeDataUrl

Description

An issue was found in the private API function qDecodeDataUrl() in QtCore, which is used in QTextDocument and QNetworkReply, and, potentially, in user code. If the function was called with malformed data, for example, an URL that contained a "charset" parameter that lacked a value (such as "data:charset,"), and Qt was built with assertions enabled, then it would hit an assertion, resulting in a denial of service (abort). This impacts Qt up to 5.15.18, 6.0.0->6.5.8, 6.6.0->6.8.3 and 6.9.0. This has been fixed in 5.15.19, 6.5.9, 6.8.4 and 6.9.1.

Category

8.4
CVSS
Severity: High
CVSS 4.0 •
EPSS 0.06%
Affected: The Qt Company Qt
Published at:
Updated at:

References

Link Tags
https://codereview.qt-project.org/c/qt/qtbase/+/642006

Frequently Asked Questions

What is the severity of CVE-2025-5455?
CVE-2025-5455 has been scored as a high severity vulnerability.
How to fix CVE-2025-5455?
To fix CVE-2025-5455, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-5455 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-5455 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-5455?
CVE-2025-5455 affects The Qt Company Qt.
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