diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index de28a6183e9..320f9e20a5d 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -332,6 +332,7 @@ qt_internal_add_module(Core
         QT_NO_CONTEXTLESS_CONNECT
         QT_NO_FOREACH
         QT_NO_QPAIR
+        QT_NO_QSNPRINTF
         QT_NO_USING_NAMESPACE
         QT_TYPESAFE_FLAGS
         QT_USE_NODISCARD_FILE_OPEN
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp
index 6ce7f97580b..537bcc16c59 100644
--- a/src/corelib/global/qglobal.cpp
+++ b/src/corelib/global/qglobal.cpp
@@ -361,6 +361,7 @@ bool QInternal::activateCallbacks(Callback cb, void **parameters)
     \row \li 6.7.0 \li Overloads of QObject::connect that do not take a context object (see \l{QT_NO_CONTEXTLESS_CONNECT})
     \row \li 6.8.0 \li The qAsConst() function (see \l{QT_NO_QASCONST})
     \row \li 6.8.0 \li File-related I/O classes have their \c{open()} functions marked \c{[[nodiscard]]} (see \l{QT_USE_NODISCARD_FILE_OPEN})
+    \row\li  6.9.0 \li The qsnprintf() and qvnprintf() functions (see \l{QT_NO_QSNPRINTF}).
     \endtable
 
     Moreover, individual APIs may also get disabled as part of the
diff --git a/src/corelib/global/qtconfigmacros.h b/src/corelib/global/qtconfigmacros.h
index b643122d5c1..c2001efac3e 100644
--- a/src/corelib/global/qtconfigmacros.h
+++ b/src/corelib/global/qtconfigmacros.h
@@ -205,6 +205,10 @@ namespace QT_NAMESPACE {}
 #    define QT_USE_NODISCARD_FILE_OPEN
 #  endif
 #endif // 6.8.0
+
+#if QT_ENABLE_STRICT_MODE_UP_TO >= QT_VERSION_CHECK(6, 9, 0)
+#  define QT_NO_QSNPRINTF
+#endif // 6.9.0
 #endif // QT_ENABLE_STRICT_MODE_UP_TO
 
 #endif /* QTCONFIGMACROS_H */
diff --git a/src/corelib/io/qdebug.cpp b/src/corelib/io/qdebug.cpp
index 600b8b13b80..e9b58855f5d 100644
--- a/src/corelib/io/qdebug.cpp
+++ b/src/corelib/io/qdebug.cpp
@@ -11,6 +11,7 @@
 
 #include <array>
 #include <q20chrono.h>
+#include <cstdio>
 
 QT_BEGIN_NAMESPACE
 
@@ -406,9 +407,9 @@ static QByteArray timeUnit(qint64 num, qint64 den)
     };
     auto appendNumber = [&](qint64 value) {
         if (value >= 10'000 && (value % 1000) == 0)
-            len += qsnprintf(buf + len, sizeof(buf) - len, "%.6g", double(value));  // "1e+06"
+            len += std::snprintf(buf + len, sizeof(buf) - len, "%.6g", double(value));  // "1e+06"
         else
-            len += qsnprintf(buf + len, sizeof(buf) - len, "%lld", value);
+            len += std::snprintf(buf + len, sizeof(buf) - len, "%lld", value);
     };
     appendChar('[');
     appendNumber(num);
diff --git a/src/corelib/io/qfilesystemengine_win.cpp b/src/corelib/io/qfilesystemengine_win.cpp
index 3ec32e31a12..bdcac20dd32 100644
--- a/src/corelib/io/qfilesystemengine_win.cpp
+++ b/src/corelib/io/qfilesystemengine_win.cpp
@@ -37,6 +37,8 @@
 #define SECURITY_WIN32
 #include <security.h>
 
+#include <cstdio>
+
 #include <QtCore/private/qfunctions_win_p.h>
 
 #ifndef SPI_GETPLATFORMTYPE
@@ -1010,10 +1012,10 @@ static inline QByteArray fileId(HANDLE handle)
     BY_HANDLE_FILE_INFORMATION info;
     if (GetFileInformationByHandle(handle, &info)) {
         char buffer[sizeof "01234567:0123456701234567"];
-        qsnprintf(buffer, sizeof(buffer), "%lx:%08lx%08lx",
-                  info.dwVolumeSerialNumber,
-                  info.nFileIndexHigh,
-                  info.nFileIndexLow);
+        std::snprintf(buffer, sizeof(buffer), "%lx:%08lx%08lx",
+                      info.dwVolumeSerialNumber,
+                      info.nFileIndexHigh,
+                      info.nFileIndexLow);
         return buffer;
     }
     return QByteArray();
diff --git a/src/corelib/kernel/qeventdispatcher_unix.cpp b/src/corelib/kernel/qeventdispatcher_unix.cpp
index 21bd2244157..1b7a6537b05 100644
--- a/src/corelib/kernel/qeventdispatcher_unix.cpp
+++ b/src/corelib/kernel/qeventdispatcher_unix.cpp
@@ -14,6 +14,8 @@
 #include <private/qcoreapplication_p.h>
 #include <private/qcore_unix_p.h>
 
+#include <cstdio>
+
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -87,7 +89,7 @@ bool QThreadPipe::init()
 #if defined(Q_OS_WASM)
     // do nothing.
 #elif defined(Q_OS_VXWORKS)
-    qsnprintf(name, sizeof(name), "/pipe/qt_%08x", int(taskIdSelf()));
+    std::snprintf(name, sizeof(name), "/pipe/qt_%08x", int(taskIdSelf()));
 
     // make sure there is no pipe with this name
     pipeDevDelete(name, true);
diff --git a/src/corelib/text/qbytearrayalgorithms.h b/src/corelib/text/qbytearrayalgorithms.h
index 5b2b71838fa..7b9529eba95 100644
--- a/src/corelib/text/qbytearrayalgorithms.h
+++ b/src/corelib/text/qbytearrayalgorithms.h
@@ -138,11 +138,13 @@ Q_CORE_EXPORT int qstricmp(const char *, const char *);
 Q_CORE_EXPORT int qstrnicmp(const char *, const char *, size_t len);
 Q_CORE_EXPORT int qstrnicmp(const char *, qsizetype, const char *, qsizetype = -1);
 
+#ifndef QT_NO_QSNPRINTF // use std::(v)snprintf() from <cstdio> instead
 // implemented in qvsnprintf.cpp
 Q_CORE_EXPORT int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
     Q_ATTRIBUTE_FORMAT_PRINTF(3, 0);
 Q_CORE_EXPORT int qsnprintf(char *str, size_t n, const char *fmt, ...)
     Q_ATTRIBUTE_FORMAT_PRINTF(3, 4);
+#endif // QT_NO_QSNPRINTF
 
 // qChecksum: Internet checksum
 Q_CORE_EXPORT quint16 qChecksum(QByteArrayView data, Qt::ChecksumType standard = Qt::ChecksumIso3309);
diff --git a/src/corelib/text/qlocale_tools.cpp b/src/corelib/text/qlocale_tools.cpp
index 6b04bc92cd1..00d473099d6 100644
--- a/src/corelib/text/qlocale_tools.cpp
+++ b/src/corelib/text/qlocale_tools.cpp
@@ -10,6 +10,8 @@
 #include <private/qtools_p.h>
 #include <private/qnumeric_p.h>
 
+#include <cstdio>
+
 #include <ctype.h>
 #include <errno.h>
 #include <float.h>
@@ -324,7 +326,8 @@ QSimpleParsedNumber<double> qt_asciiToDouble(const char *num, qsizetype numLen,
     constexpr auto maxDigitsForULongLong = 1 + std::numeric_limits<unsigned long long>::digits10;
     // need to ensure that we don't read more than numLen of input:
     char fmt[1 + maxDigitsForULongLong + 4 + 1];
-    qsnprintf(fmt, sizeof fmt, "%s%llu%s", "%", static_cast<unsigned long long>(numLen), "lf%n");
+    std::snprintf(fmt, sizeof fmt, "%s%llu%s",
+                  "%", static_cast<unsigned long long>(numLen), "lf%n");
 
     if (qDoubleSscanf(num, QT_CLOCALE, fmt, &d, &processed) < 1)
         processed = 0;
diff --git a/src/corelib/text/qvsnprintf.cpp b/src/corelib/text/qvsnprintf.cpp
index dd988161d53..afe526516ff 100644
--- a/src/corelib/text/qvsnprintf.cpp
+++ b/src/corelib/text/qvsnprintf.cpp
@@ -10,9 +10,22 @@
 
 QT_BEGIN_NAMESPACE
 
+/*!
+    \macro QT_NO_QSNPRINTF
+    \since 6.8
+    \relates QByteArray
+
+    Defining this macro removes the availability of the qsnprintf() and
+    qvsnprintf() functions. See the functions' documentation for why you may
+    want to disable them.
+
+    \sa qsnprintf(), qvsnprintf().
+*/
+
 #if !defined(QT_VSNPRINTF) || defined(Q_QDOC)
 
 /*!
+    \fn int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
     \relates QByteArray
 
     \obsolete
@@ -40,6 +53,7 @@ QT_BEGIN_NAMESPACE
     \sa qsnprintf(), QString::asprintf()
 */
 
+Q_CORE_EXPORT // QT_NO_QSNPRINTF is in effect
 int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
 {
     if (!str || !fmt)
@@ -62,6 +76,7 @@ QT_BEGIN_INCLUDE_NAMESPACE
 #include <stdio.h>
 QT_END_INCLUDE_NAMESPACE
 
+Q_CORE_EXPORT // QT_NO_QSNPRINTF is in effect
 int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
 {
     return QT_VSNPRINTF(str, n, fmt, ap);
@@ -70,6 +85,7 @@ int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
 #endif
 
 /*!
+    \fn int qsnprintf(char *str, size_t n, const char *fmt, ...)
     \target bytearray-qsnprintf
     \relates QByteArray
 
@@ -89,6 +105,7 @@ int qvsnprintf(char *str, size_t n, const char *fmt, va_list ap)
     \sa qvsnprintf(), QString::asprintf()
 */
 
+Q_CORE_EXPORT // QT_NO_QSNPRINTF is in effect
 int qsnprintf(char *str, size_t n, const char *fmt, ...)
 {
     va_list ap;
diff --git a/src/tools/bootstrap/CMakeLists.txt b/src/tools/bootstrap/CMakeLists.txt
index ad95d77d00e..a1f8480a1d8 100644
--- a/src/tools/bootstrap/CMakeLists.txt
+++ b/src/tools/bootstrap/CMakeLists.txt
@@ -61,7 +61,6 @@ qt_internal_extend_target(Bootstrap
         ../../corelib/text/qstringbuilder.cpp
         ../../corelib/text/qstringconverter.cpp
         ../../corelib/text/qstringlist.cpp
-        ../../corelib/text/qvsnprintf.cpp
         ../../corelib/time/qcalendar.cpp
         ../../corelib/time/qdatetime.cpp
         ../../corelib/time/qgregoriancalendar.cpp