High severity · published Jun 2, 2025
CVE-2025-5455
Possible denial of service when passing malformed data in a URL to qDecodeDataUrl
8.4
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QT
Qt · Qt
through 5.15.18; 6.0.0 through 6.5.8; 6.6.0 through 6.8.3; 6.9.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-5455
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-5455
codereview.qt-project.org
https://codereview.qt-project.org/c/qt/qtbase/+/642006
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