An out-of-bounds read vulnerability exists in the QTextCodec TSCII encoding of the Qt 5 Compatibility APIs module (Qt Core in Qt 5 and earlier). This flaw may cause applications that convert text to the TSCII encoding to read memory outside the input buffer, potentially leading to application crashes or data misinterpretation. The issue affects versions prior to 6.5.2-4.oe2403sp1 and has a medium severity rating with a CVSS score of 6.8. A security fix is available in version 6.5.2-4.oe2403sp1.