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, checkfunctionargumentnames rejected protected guard hook names for regular, variadic, and keyword-only arguments but omitted...

CVE-2026-55830

Vulnerability summary (CVE-2026-55830) : In RestrictedPython, prior to version 8.3, check_function_argument_names() failed to reject protected guard hook names for positional-only arguments, enabling a local parameter to shadow special names such as getattr , getitem , write , or print . This cou...

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, checkfunctionargumentnames rejected protected guard hook names for regular, variadic, and keyword-only arguments but omitted...