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

Q: How do I fix CVE-2023-37271?

restrictedpython: upgrade to 5.3. Exact commands for each OS are on this page.

Q: Is CVE-2023-37271 being exploited?

CVE-2023-37271 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-37271 affect?

CVE-2023-37271 affects restrictedpython. Severity is high (CVSS 8.4). 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 fra

This month

HIGH 8.4UPGRADE

CVE-2023-37271 is a high-severity flaw (CVSS 8.4) affecting restrictedpython. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 w

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.4 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 42%)
CISA exploited list	No
Weakness	CWE-913
Published	2023-07-11
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: zope

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-11 18:15 UTCPublished CVE record published
2026-06-17 06:07 UTCUpdated Record last modified

zope restrictedpython UPGRADE

Affected: < 5.3 · 6.0 · 6.0 a1.dev0

Fixed in: 5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy restrictedpython || rpm -q restrictedpython || restrictedpython --version

2. UPGRADE to 5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade restrictedpython

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade restrictedpython

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-37271?

restrictedpython: upgrade to 5.3. Exact commands for each OS are on this page.

Is CVE-2023-37271 being exploited?

CVE-2023-37271 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-37271 affect?

CVE-2023-37271 affects restrictedpython. Severity is high (CVSS 8.4). 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 fra

How urgent is CVE-2023-37271?

Priority 44/100. High severity

Software pages

Python vulnerabilities

Related CVEs

CVE-2024-47532 MEDIUM 6.5 UPGRADE RestrictedPython is a restricted execution environment for Python to run untrusted code
CVE-2023-41039 HIGH 8.3 UPGRADE RestrictedPython is a restricted execution environment for Python to run untrusted code

References

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