// For flags

CVE-2025-5455

Possible denial of service when passing malformed data in a URL to qDecodeDataUrl

Severity Score

8.4
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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.

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.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Active
System
Vulnerable | Subsequent
Confidentiality
None
None
Integrity
High
High
Availability
High
High
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2025-06-02 CVE Reserved
  • 2025-06-02 CVE Published
  • 2025-06-02 CVE Updated
  • 2025-06-02 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
The Qt Company
Search vendor "The Qt Company"
 Qt
Search vendor "The Qt Company" for product "Qt"
 <= 5.15.18
Search vendor "The Qt Company" for product "Qt" and version " <= 5.15.18"
en
Affected
The Qt Company
Search vendor "The Qt Company"
 Qt
Search vendor "The Qt Company" for product "Qt"
 >= 6.0.0 <= 6.5.8
Search vendor "The Qt Company" for product "Qt" and version " >= 6.0.0 <= 6.5.8"
en
Affected
The Qt Company
Search vendor "The Qt Company"
 Qt
Search vendor "The Qt Company" for product "Qt"
 >= 6.6.0 <= 6.8.3
Search vendor "The Qt Company" for product "Qt" and version " >= 6.6.0 <= 6.8.3"
en
Affected