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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.

PUBLISHED Reserved 2025-06-02 | Published 2025-06-02 | Updated 2025-06-02 | Assigner TQtC




HIGH: 8.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/R:U/RE:M/U:Clear

Problem types

CWE-20 Improper Input Validation

Product status

Default status
unaffected

Any version
affected

6.0.0 (python)
affected

6.5.9 (python)
unaffected

6.6.0 (python)
affected

6.8.4 (python)
unaffected

6.9.0 (python)
affected

6.9.1 (python)
unaffected

References

codereview.qt-project.org/c/qt/qtbase/+/642006

cve.org (CVE-2025-5455)

nvd.nist.gov (CVE-2025-5455)

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