RestrictedPython guard hooks can be shadowed via positional-only arguments
High-risk advisory
CVE-2026-55830
Summary
RestrictedPython guard hooks can be shadowed via positional-only arguments
Why it matters
GitHub has published a reviewed security advisory for RestrictedPython. Prioritize it with other application dependency updates, especially because EPSS places it in the 33% percentile.
Operator check
Check whether RestrictedPython is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.4%; percentile: 33%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.