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    <p>Yes, they can be maliciously exploited.</p> <p>If you really want safe sandboxing, you could look at <a href="http://codespeak.net/pypy/dist/pypy/doc/sandbox.html" rel="nofollow">PyPy's sandboxing features</a>, but be aware that sandboxing is not easy, and there may be better ways to accomplish whatever you are seeking.</p> <h2>Correction</h2> <p>Since you've updated your question to clarify that you're only parsing the untrusted input to AST, there is no need to sandbox anything: sandboxing is specifically about <em>executing</em> untrusted code (which most people probably assumed your goal was, by asking about sandboxing).</p> <p>Using <code>compile</code> / <code>compiler</code> only for parsing this way should be safe: Python source parsing does not have any hooks into code execution. (Note that this is not necessarily true of all languages: for example, Perl cannot be (completely) parsed without code execution.)</p> <p>The only other remaining risk is that someone may be able to craft some pathological Python source code that makes one of the parsers use runaway amounts of memory / processor time, but resource exhaustion attacks affect everything, so you'll just want to manage this as it becomes necessary. (For example, if your deployment is mission-critical and cannot afford a denial of service by an attacker armed with pathological source code, you can execute the parsing in a <a href="http://docs.python.org/library/resource.html" rel="nofollow">resource-limited</a> subprocess).</p>
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    1. POAre Python functions "compile" and "compiler.parse" safe (sandboxed)?
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    1. COHow? How can they be exploited? What's the attack against `compile`?
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    2. COS.Lott: clarified, based on your updated question.
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    3. CO...based on *dekomote*'s updated question, even.
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