An integer overflow vulnerability exists in the g_string_maybe_expand() function of the GLib library. When extremely large strings are used and more data is appended, an internal size calculation can wrap around, making the system incorrectly assume that there’s enough space in the buffer. This leads to a buffer overflow, causing memory corruption or a crash. Although difficult to exploit in practice due to the extremely large memory conditions required, this issue could be triggered remotely if an application accepts large untrusted input and uses GString for string operations.