void buffer_reserve(Buffer *buffer, size_t len)
{
    if ((buffer->capacity - buffer->offset) < len) {
        buffer->capacity += (len + 1024);
        buffer->buffer = g_realloc(buffer->buffer, buffer->capacity);
        if (buffer->buffer == NULL) {
            fprintf(stderr, "vnc: out of memory\n");
            exit(1);
        }
    }
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.