CVE-2025-5455
June 02, 2025
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.
Affected Packages
https://github.com/qt/qtbase.git (GITHUB):
Affected version(s) =v6.9.0 <v6.9.1Fix Suggestion:
Update to version v6.9.1https://github.com/qt/qtbase.git (GITHUB):
Affected version(s) >=v6.6.0 <v6.8.4Fix Suggestion:
Update to version v6.8.4https://github.com/qt/qtbase.git (GITHUB):
Affected version(s) >=v5.0.0-beta1 <v5.15.19Fix Suggestion:
Update to version v5.15.19https://github.com/qt/qtbase.git (GITHUB):
Affected version(s) >=v6.0.0 <v6.5.9Fix Suggestion:
Update to version v6.5.9Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
ACTIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Input Validation
EPSS
Base Score:
0.12
