CVE-2025-5455

Name	CVE-2025-5455
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
qt6-base (PTS)	bookworm	6.4.2+dfsg-10	vulnerable
	trixie, sid	6.8.2+dfsg-7	vulnerable
qtbase-opensource-src (PTS)	bullseye	5.15.2+dfsg-9+deb11u1	vulnerable
	bookworm	5.15.8+dfsg-11+deb12u3	vulnerable
	trixie, sid	5.15.15+dfsg-5	vulnerable
qtbase-opensource-src-gles (PTS)	bullseye	5.15.2+dfsg-4	vulnerable
	bookworm	5.15.8+dfsg-3	vulnerable
	trixie, sid	5.15.15+dfsg-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
qt6-base	source	(unstable)	(unfixed)
qtbase-opensource-src	source	(unstable)	(unfixed)
qtbase-opensource-src-gles	source	(unstable)	(unfixed)

Notes

[bookworm] - qt6-base <no-dsa> (Minor issue)
[bookworm] - qtbase-opensource-src <no-dsa> (Minor issue)
[bullseye] - qtbase-opensource-src <postponed> (Minor issue; DoS for local user)
[bookworm] - qtbase-opensource-src-gles <no-dsa> (Minor issue)
[bullseye] - qtbase-opensource-src-gles <postponed> (Minor issue; DoS for local user)
https://codereview.qt-project.org/c/qt/qtbase/+/642006