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CVE-2020-14343

Published: 9 February 2021

A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.

Priority

Medium

CVSS 3 base score: 9.8

Status

Package Release Status
pyyaml
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal
Released (5.3.1-1ubuntu0.1)
groovy
Released (5.3.1-2ubuntu0.1)
hirsute
Released (5.3.1-3ubuntu1)
precise Not vulnerable
(code not present)
trusty Not vulnerable
(code not present)
upstream
Released (5.4.1)
xenial Not vulnerable
(code not present)
Patches:
upstream: https://github.com/yaml/pyyaml/commit/7adc0db3f613a82669f2b168edd98379b83adb3c