CVE-2021-42771

Publication date 20 October 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
python-babel	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

leosilva

fixed as CVE-2021-20095. But that CVE number was rejected and that new one was assigned to that issue.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
python-babel	Upstream: https://github.com/python-babel/babel/pull/782/commits/3a700b5b8b53606fd98ef8294a56f9510f7290f8 Upstream: https://github.com/python-babel/babel/pull/782/commits/5caf717ceca4bd235552362b4fbff88983c75d8c

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.8 · High

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	7.8 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H