EUVD-2026-42434

RestrictedPython guard hooks can be shadowed via positional-only arguments...

GHSA-FFG3-P8FM-MJX2 RestrictedPython guard hooks can be shadowed via positional-only arguments

Impact RestrictedPython rewrites sensitive operations to go through guard hooks. Attribute access becomes getattrobj, name, item access becomes getitemobj, key, writes go through write, and print goes through print. The embedding application supplies these hooks to enforce its policy. Argument-na...

RestrictedPython guard hooks can be shadowed via positional-only arguments

Impact RestrictedPython rewrites sensitive operations to go through guard hooks. Attribute access becomes getattrobj, name, item access becomes getitemobj, key, writes go through write, and print goes through print. The embedding application supplies these hooks to enforce its policy. Argument-na...

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 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...