Vulnerability · Published Feb 9, 2021 · Assigned by redhat
CVE-2020-14343
Critical 9.8
In plain English
A critical-severity improper input validation in PyYAML. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 6.2% (higher than 94% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)9.8Critical
Exploit odds (30 days)6.2%top 6.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | python38-Cython | 0.29.14-4.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-PyMySQL | 0.10.1-1.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-asn1crypto | 1.2.0-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-atomicwrites | 1.3.0-8.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-atomicwrites | 1.3.0-8.module_el8.4.0+2510+cb4d423d | ALSA-2021:2583 |
| AlmaLinux:8 | python38-attrs | 19.3.0-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-attrs | 19.3.0-3.module_el8.4.0+2510+cb4d423d | ALSA-2021:2583 |
| AlmaLinux:8 | python38-cffi | 1.13.2-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-chardet | 3.0.4-19.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-cryptography | 2.8-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-idna | 2.8-6.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-markupsafe | 1.1.1-6.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-mod_wsgi | 4.6.8-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-more-itertools | 7.2.0-5.module_el8.4.0+2510+cb4d423d | ALSA-2021:2583 |
| AlmaLinux:8 | python38-more-itertools | 7.2.0-5.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-packaging | 19.2-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-packaging | 19.2-3.module_el8.4.0+2510+cb4d423d | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pluggy | 0.13.0-3.module_el8.4.0+2510+cb4d423d | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pluggy | 0.13.0-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-ply | 3.11-10.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-psycopg2 | 2.8.4-4.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-psycopg2-doc | 2.8.4-4.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-psycopg2-tests | 2.8.4-4.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-py | 1.8.0-8.module_el8.4.0+2510+cb4d423d | ALSA-2021:2583 |
| AlmaLinux:8 | python38-py | 1.8.0-8.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pycparser | 2.19-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pyparsing | 2.4.5-3.module_el8.4.0+2510+cb4d423d | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pyparsing | 2.4.5-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pysocks | 1.7.1-4.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pytest | 4.6.6-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pytest | 4.6.6-3.module_el8.4.0+2510+cb4d423d | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pytz | 2019.3-3.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-pyyaml | 5.4.1-1.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-requests | 2.22.0-9.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-scipy | 1.3.1-4.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-six | 1.12.0-10.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-wcwidth | 0.1.7-16.module_el8.6.0+2778+cd494b30 | ALSA-2021:2583 |
| AlmaLinux:8 | python38-wcwidth | 0.1.7-16.module_el8.4.0+2510+cb4d423d | ALSA-2021:2583 |
| Alpine:v3.20 | py3-yaml | 5.4-r0 | ALPINE-CVE-2020-14343 |
| Alpine:v3.21 | py3-yaml | 5.4-r0 | ALPINE-CVE-2020-14343 |
| Alpine:v3.22 | py3-yaml | 5.4-r0 | ALPINE-CVE-2020-14343 |
| Alpine:v3.23 | py3-yaml | 5.4-r0 | ALPINE-CVE-2020-14343 |
| Alpine:v3.24 | py3-yaml | 5.4-r0 | ALPINE-CVE-2020-14343 |
| Debian:12 | pyyaml | 5.3.1-4 | DEBIAN-CVE-2020-14343 |
| Debian:13 | pyyaml | 5.3.1-4 | DEBIAN-CVE-2020-14343 |
| Debian:14 | pyyaml | 5.3.1-4 | DEBIAN-CVE-2020-14343 |
| PyPI | pyyaml | 5.4 | PYSEC-2021-142 |
| PyPI | pyyaml | 5.4 | GHSA-8q59-q68h-6hv4 |
| Rocky Linux:8 | Cython | 0:0.29.14-4.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | PyYAML | 0:5.4.1-1.module+el8.5.0+672+ab6eb015 | RLSA-2021:2583 |
| Rocky Linux:8 | PyYAML | 0:5.4.1-1.module+el8.4.0+574+843c4898 | RLSA-2021:2583 |
| Rocky Linux:8 | babel | 0:2.7.0-10.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | mod_wsgi | 0:4.6.8-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | numpy | 0:1.17.3-5.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | pytest | 0:4.6.6-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-PyMySQL | 0:0.10.1-1.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-PyMySQL | 0:0.10.1-1.module+el8.5.0+672+ab6eb015 | RLSA-2021:2583 |
| Rocky Linux:8 | python-asn1crypto | 0:1.2.0-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-atomicwrites | 0:1.3.0-8.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-attrs | 0:19.3.0-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-cffi | 0:1.13.2-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-chardet | 0:3.0.4-19.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-cryptography | 0:2.8-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-cryptography | 0:2.8-3.module+el8.5.0+672+ab6eb015 | RLSA-2021:2583 |
| Rocky Linux:8 | python-idna | 0:2.8-6.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-jinja2 | 0:2.10.3-4.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-lxml | 0:4.4.1-5.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-markupsafe | 0:1.1.1-6.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-more-itertools | 0:7.2.0-5.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-packaging | 0:19.2-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-pluggy | 0:0.13.0-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-ply | 0:3.11-10.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-psutil | 0:5.6.4-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-psycopg2 | 0:2.8.4-4.module+el8.6.0+794+eba84017 | RLSA-2021:2583 |
| Rocky Linux:8 | python-psycopg2 | 0:2.8.4-4.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-py | 0:1.8.0-8.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-pycparser | 0:2.19-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-pysocks | 0:1.7.1-4.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-requests | 0:2.22.0-9.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-urllib3 | 0:1.25.7-4.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-wcwidth | 0:0.1.7-16.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python-wheel | 0:0.33.6-5.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python38 | 0:3.8.6-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python3x-pip | 0:19.3.1-1.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python3x-pyparsing | 0:2.4.5-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python3x-setuptools | 0:41.6.0-4.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | python3x-six | 0:1.12.0-10.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | pytz | 0:2019.3-3.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | scipy | 0:1.3.1-4.module+el8.4.0+570+c2eaf144 | RLSA-2021:2583 |
| Rocky Linux:8 | scipy | 0:1.3.1-4.module+el8.5.0+672+ab6eb015 | RLSA-2021:2583 |
Affected products (as reported)
Weakness: CWE-20