Is CVE-2026-55830 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-55830?

CVE-2026-55830 has a CVSS v3 severity of HIGH (8.3).

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CVE-2026-55830

Description

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.