Executive brief
A vulnerability exists in the Qt XML library, a widely used framework for developing cross-platform software applications. When an application uses this library to generate XML files, it may fail to properly clean up special characters in certain data fields. This could allow an attacker to inject malicious data that alters the structure of the XML document, potentially leading to unauthorized data modification or security bypasses in systems that rely on those files.
Technical details
An XML injection vulnerability (CWE-91) exists in the QDom component of Qt XML due to improper output neutralization during serialization. Specifically, when using the default InvalidDataPolicy (AcceptInvalidChars), the library fails to escape node terminators for comments, CDATA sections, and processing instructions. An attacker providing crafted input to an application that serializes this data can inject arbitrary XML elements or attributes into the resulting document. This affects Qt versions 4.0.0 through 6.11 and is addressed in version 6.12.
Affected products
- Qt Group Qt XML 4.0.0 through 6.11.x
Timeline
- 2026-07-23: disclosed
- 2026-07-23: advisory