Threat Intelligence Database

CVE-2026-78253 is a medium severity vulnerability in Qt's QXmlStreamReader::readElementText() function that allows denial of service via uncontrolled recursion. An attacker can cause an application crash by supplying a crafted XML document that triggers stack exhaustion.

CVE-2026-19248 is a high-severity vulnerability in the Qt framework's QDomDocument XML parsing component. It involves uncontrolled recursion that can be triggered remotely by processing crafted untrusted XML input, leading to a denial-of-service (DoS) crash. The affected versions range from 2.2.0 through 6.8.8 and 6.9.0 through 6.11.1. There is no explicit patch or remediation information provided in the source data. No known exploits in the wild have been reported.

An out-of-bounds read (buffer over-read) vulnerability exists in QTextCodec::codecForName() in Qt. When the function is called with a QByteArray that is not NUL-terminated (for example, one created with QByteArray::fromRawData()), the codec-name matching routine reads past the end of the supplied buffer. In most cases this results in an incorrect text codec being selected; in the worst case, if the over-read reaches unmapped memory, the process crashes (denial of service). The over-read is bounded by the length of the longest codec-name candidate, and the out-of-bounds bytes are only compared internally against Qt's fixed list of codec names, so no data is disclosed to an attacker. Applications that do not pass non-NUL-terminated QByteArrays to QTextCodec::codecForName() are not exposed. The affected code resides in the Qt5Compat module from Qt 6.0.0 onward, and in Qt Core (qtbase) in Qt 4.x and Qt 5.x.

Qt 6 through 6.6 was discovered to contain a NULL pointer dereference via the function QXcbConnection::initializeAllAtoms(). NOTE: this is disputed because it is not expected that an X application should continue to run when there is arbitrary anomalous behavior from the X server.

MediumVulnerabilityGermanyFranceUnited Kingdom+2#cve#cve-2023-45935