CVE-2026-55830 — RestrictedPython guard hooks can be shadowed via positional-only arguments
RestrictedPython is a tool that helps to define a subset of the Python language which allows to provide a program input into a trusted environment. Prior to 8.3, check_function_…
Published: 2026-07-08 · CVSS: 8.3 · CVSS 3.1
RestrictedPython is a tool that helps to define a subset of the Python language which allows to provide a program input into a trusted environment. Prior to 8.3, check_function_argument_names() rejected protected guard hook names for regular, variadic, and keyword-only arguments but omitted positional-only arguments, allowing __getattr__, _getitem_, _write_, or _print_ to be shadowed by a local parameter and bypass the embedding application's access policy. This issue is fixed in version 8.3.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7