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Check positional-only argument names #325

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Check positional-only argument names #325

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5 changes: 4 additions & 1 deletion CHANGES.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,10 @@ Changes
8.3 (unreleased)
----------------

- Nothing changed yet.
- Also validate positional-only argument names (parameters before ``/``) so
they cannot start with an underscore, closing a sandbox escape where a
positional-only parameter could shadow an injected protected name such as
``_getattr_``, ``_getitem_``, ``_write_`` or ``_print_``.


8.3a1.dev0 (2026-05-29)
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3 changes: 3 additions & 0 deletions src/RestrictedPython/transformer.py
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Expand Up @@ -387,6 +387,9 @@ def check_name(self, node, name, allow_magic_methods=False):
self.error(node, f'"{name}" is a reserved name.')

def check_function_argument_names(self, node):
for arg in node.args.posonlyargs:
self.check_name(node, arg.arg)

for arg in node.args.args:
self.check_name(node, arg.arg)

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