---
id: CVE-2025-22153
aliases:
  - GHSA-gmj9-h825-chq2
  - PYSEC-2026-1874
title: >-
  try/except* clauses could allow bypass RestrictedPython via type confusion bug
  in the CPython interpreter
summary: >-
  try/except* clauses could allow bypass RestrictedPython via type confusion bug
  in the CPython interpreter
severity: high
cvss: 7.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L'
vendor: restrictedpython
product: restrictedpython
ecosystem: pip
affected:
  - 'restrictedpython >= 6.0, < 8.0'
patched:
  - restrictedpython 8.0
published: '2025-01-23'
updated: '2026-07-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-gmj9-h825-chq2'
references:
  - url: >-
      https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-gmj9-h825-chq2
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-22153'
  - url: >-
      https://github.com/zopefoundation/RestrictedPython/commit/48a92c5bb617a647cffd0dadd4d5cfe626bcdb2f
  - url: 'https://github.com/zopefoundation/RestrictedPython'
tags:
  - osv
  - pip
epss: 0.00402
epssPercentile: 0.34289
ingestedAt: '2026-07-08T18:25:49.742Z'
---

## Overview

### Impact
Via a type confusion bug in the CPython interpreter when using `try/except*` RestrictedPython could be bypassed.

We believe this should be fixed upstream in Python itself until that we remove support for `try/except*` from RestrictedPython.
(It has been fixed for some Python versions.)

### Patches
Patched in version 8.0 by removing support for `try/except*` clauses

### Workarounds
There is no workaround.

### References
none


## Affected packages

- `restrictedpython >= 6.0, < 8.0`

## Remediation

Upgrade to a patched release:

- `restrictedpython 8.0`