CVE-2025-22153 try/except* clauses could allow bypass RestrictedPython via type confusion bug in the CPython interpreter
A type confusion bug in CPython allows attackers to bypass RestrictedPython sandbox restrictions, potentially executing unauthorized code.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-22153?
CVE-2025-22153 is a high-severity vulnerability in zopefoundation RestrictedPython, published on 23 Jan 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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. Via a type confusion bug in versions of the CPython interpreter starting in 3.11 and prior to 3.13.2 when using `try/except*`, RestrictedPython starting in version 6.0 and prior to version 8.0 could be bypassed. The issue is patched in version 8.0 of RestrictedPython by removing support for `try/except*` clauses. No known workarounds are available.
Weakness: CWE-843
Which versions are affected by CVE-2025-22153?
3 open source packages ship an affected version, including restrictedpython and RestrictedPython.
| Package | Affected | Fixed in |
|---|---|---|
restrictedpython PyPI | From 6.0 | 8.0 |
restrictedpython PyPI | From 6.0 | 8.0 |
RestrictedPython PyPI | From 6.0 | 8.0 |
How do I fix CVE-2025-22153?
Upgrade restrictedpython to 8.0 or later.
Is CVE-2025-22153 being exploited?
There is no known exploitation of CVE-2025-22153 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-22153, GHSA-gmj9-h825-chq2, PYSEC-2026-1874, UBUNTU-CVE-2025-22153.