What’s Vulnerable › Vulnerabilities

CVE-2021-42771

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-20 · updated 2026-06-17
• Weakness: CWE-22

Description

Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.

Affected products

• Debian Linux: 10.0
• Pocoo Babel: before 2.9.1 — fixed in 2.9.1

How to fix

Upgrade to a fixed version: Pocoo Babel 2.9.1. Check the vendor advisory for mitigations.

References

• https://github.com/python-babel/babel/pull/782
• https://lists.debian.org/debian-lts-announce/2021/10/msg00018.html
• https://lists.debian.org/debian-lts/2021/10/msg00040.html
• https://www.debian.org/security/2021/dsa-5018
• https://www.tenable.com/security/research/tra-2021-14
• https://github.com/python-babel/babel/pull/782
• https://lists.debian.org/debian-lts-announce/2021/10/msg00018.html
• https://lists.debian.org/debian-lts/2021/10/msg00040.html
• https://www.debian.org/security/2021/dsa-5018
• https://www.tenable.com/security/research/tra-2021-14

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