CVE-2025-5455 — Improper Input Validation in Qt6-base

CWE-20 — Improper Input ValidationCWE-617 — Reachable Assertion6 documents6 sources
Severity
8.4HIGHNVD
EPSS
0.4%
top 40.24%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
6
Debian Qt6-baseDebian Qtbase-opensource-srcDebian Qtbase-opensource-src-gles+3 more
Timeline
PublishedJun 2
Latest updateJun 10

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…

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H

Affected Packages6 packages

▶debiandebian/qt6-base< qt6-base 6.8.2+dfsg-8 (forky)
▶debiandebian/qtbase-opensource-src< qt6-base 6.8.2+dfsg-8 (forky)
▶debiandebian/qtbase-opensource-src-gles< qt6-base 6.8.2+dfsg-8 (forky)
▶CVEListV5the_qt_company/qt6.0.0 — 6.5.8+3

🔴Vulnerability Details

2
OSV
CVE-2025-5455: An issue was found in the private API function qDecodeDataUrl() in QtCore, which is used in QTextDocument and QNetworkReply, and, potentially, in user↗2025-06-02
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GHSA
GHSA-5cfg-qhv9-4842: An issue was found in the private API function qDecodeDataUrl() in QtCore, which is used in QTextDocument and QNetworkReply, and, potentially, in user↗2025-06-02
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📋Vendor Advisories

3
Microsoft
Possible denial of service when passing malformed data in a URL to qDecodeDataUrl↗2025-06-10
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Red Hat
qt6-qtbase: qt5-qtbase: QtCore Assertion Failure Denial of Service↗2025-06-02
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Debian
CVE-2025-5455: qt6-base - An issue was found in the private API function qDecodeDataUrl() in QtCore, which...↗2025
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CVE-2025-5455 — Improper Input Validation in Qt6-base | cvebase