Yes, the use of variable variables in programming languages can potentially make code vulnerable to injection attacks.

In PHP, for example, if the value of the variable used to create a variable variable is controlled by an attacker, it can lead to unexpected behavior or security issues. Consider the following example:
```
$user_input = "foo";
// An attacker can set $user_input to "foo'; phpinfo(); //" to execute arbitrary code
```
In this case, an attacker can inject code into the value of $user_input and execute arbitrary code through the variable variable.
Similarly, in Perl, if the value of the scalar variable used to create a symbolic reference is controlled by an attacker, it can lead to similar security issues.
In Bash, the use of eval to create variable variables can also lead to injection vulnerabilities if the input passed to eval is not properly sanitized.
In general, it's important to validate and sanitize any user input that is used to create variable variables, or to avoid using variable variables altogether if possible.
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