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try/except* clauses could allow bypass RestrictedPython via type confusion bug in the CPython interpreter

High
icemac published GHSA-gmj9-h825-chq2 Jan 23, 2025

Package

CPython

Affected versions

>= 3.11 < 3.13.2

Patched versions

3.13.2
pip RestrictedPython (pip)
>= 6.0, <8.0
8.0

Description

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

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L

CVE ID

CVE-2025-22153

Weaknesses

No CWEs

Credits