# CVE-2023-37271: restrictedpython: RestrictedPython is a tool that helps to define a subset of the Python language which allows users to provide a progr...

CVE-2023-37271 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2023-37271, released July 11, 2023. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2023-37271
- Priority: Urgent
- CVSS: 9.9 (critical)
- EPSS: 0.0085
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 11, 2023

## Description

RestrictedPython is a tool that helps to define a subset of the Python language which allows users to provide a program input into a trusted environment. RestrictedPython does not check access to stack frames and their attributes. Stack frames are accessible within at least generators and generator expressions, which are allowed inside RestrictedPython. Prior to versions 6.1 and 5.3, an attacker with access to a RestrictedPython environment can write code that gets the current stack frame in a generator and then walk the stack all the way beyond the RestrictedPython invocation boundary, thus breaking out of the restricted sandbox and potentially allowing arbitrary code execution in the Python interpreter. All RestrictedPython deployments that allow untrusted users to write Python code in the RestrictedPython environment are at risk. In terms of Zope and Plone, this would mean deployments where the administrator allows untrusted users to create and/or edit objects of type `Script (Python)`, `DTML Method`, `DTML Document` or `Zope Page Template`. This is a non-default configuration and likely to be extremely rare. The problem has been fixed in versions 6.1 and 5.3.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python3-restrictedpython Ubuntu 20.04 LTS (focal) | 4.0~b3-2ubuntu0.1~esm1 | [python3-restrictedpython 4.0~b3-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-restrictedpython-4.0-b3-2ubuntu0.1-esm1.md) | Sep 30, 2024 |
| Linux | python3-restrictedpython Ubuntu 22.04.1 LTS (jammy) | 4.0~b3-3ubuntu0.1~esm1 | [python3-restrictedpython 4.0~b3-3ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-restrictedpython-4.0-b3-3ubuntu0.1-esm1.md) | Sep 30, 2024 |
| Linux | restrictedpython Debian 13.5 (trixie) | 6.2-1 | [DEBIAN-CVE-2023-37271](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37271.md) | Jul 11, 2023 |
| Linux | restrictedpython Debian 14 | 6.2-1 | [DEBIAN-CVE-2023-37271](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37271.md) | Jul 11, 2023 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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