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.
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade python38-pyUpgrade python38-psycopg2Upgrade python38-chardetUpgrade python38-attrsUpgrade python38-pyyamlUpgrade python38-atomicwritesUpgrade python38-more-itertoolsUpgrade python38-wcwidthUpgrade python38-pyparsingUpgrade python38-mod_wsgiUpgrade python38-pysocksUpgrade python38-cryptographyUpgrade python38-scipyUpgrade python38-markupsafeUpgrade python38-pytestUpgrade python38-CythonUpgrade python38-plyUpgrade python38-psycopg2-docUpgrade python38-packagingUpgrade python38-PyMySQLUpgrade python38-idnaUpgrade python38-pluggyUpgrade python38-asn1cryptoUpgrade python38-sixUpgrade python38-pycparserUpgrade python38-pytzUpgrade python38-psycopg2-testsUpgrade python38-cffiUpgrade python38-requests | May 4, 2022 | Feb 9, 2021 |
| Alpine Linux | — | Upgrade py3-yaml | Mar 26, 2024 | Feb 9, 2021 |
| Centos_linux | — | Upgrade python38-develUpgrade python38-mod_wsgiUpgrade Cython-debugsourceUpgrade python38-babelUpgrade python38-pyyamlUpgrade python38-numpy-debuginfoUpgrade scipy-debugsourceUpgrade python38-sixUpgrade python38-debugsourceUpgrade python38-jinja2Upgrade python38-lxmlUpgrade python38-pyyaml-debuginfoUpgrade python38-scipy-debuginfoUpgrade python38-pysocksUpgrade python-cryptography-debugsourceUpgrade python38-lxml-debuginfoUpgrade python38-asn1cryptoUpgrade python38-rpm-macrosUpgrade python38-psycopg2-debuginfoUpgrade python-psycopg2-debugsourceUpgrade python38-cffi-debuginfoUpgrade python38-debugUpgrade python38-pytzUpgrade python38-markupsafeUpgrade python38-setuptoolsUpgrade python38-idleUpgrade python38-pipUpgrade python38-plyUpgrade python38-Cython-debuginfoUpgrade python38-chardetUpgrade python38-CythonUpgrade python38-pip-wheelUpgrade python38-psutil-debuginfoUpgrade python38-pycparserUpgrade python38-psutilUpgrade python38-markupsafe-debuginfoUpgrade python38-cffiUpgrade python38-libsUpgrade python-lxml-debugsourceUpgrade python38-setuptools-wheelUpgrade python38-psycopg2-docUpgrade python38-debuginfoUpgrade python38-cryptography-debuginfoUpgrade python38-cryptographyUpgrade python38-scipyUpgrade python38-wheelUpgrade python38-requestsUpgrade python38-numpy-f2pyUpgrade python38-urllib3Upgrade python38Upgrade python38-numpyUpgrade PyYAML-debugsourceUpgrade python-cffi-debugsourceUpgrade python38-wheel-wheelUpgrade python38-psycopg2-testsUpgrade python38-testUpgrade python38-PyMySQLUpgrade python38-psycopg2Upgrade python38-numpy-docUpgrade python38-idnaUpgrade python-markupsafe-debugsourceUpgrade numpy-debugsourceUpgrade python-psutil-debugsourceUpgrade python38-tkinter | Jun 30, 2021 | Feb 9, 2021 |
| Debian | — | Upgrade pyyaml | Jul 30, 2024 | Feb 9, 2021 |
| Dell Powerstore Dsa2024462 | — | Upgrade Dell PowerStoreOS to the latest version | Oct 23, 2025 | Nov 20, 2024 |
| Dell Powerstore Dsa2025050 | — | Upgrade Dell PowerStoreOS to the latest version | Oct 23, 2025 | Jan 28, 2025 |
| Freebsd | — | Upgrade py37-yamlUpgrade py36-yamlUpgrade py38-yamlUpgrade py39-yaml | Nov 4, 2022 | Jun 2, 2021 |
| Gentoo Linux | — | Upgrade dev-python/pyyaml. | Feb 27, 2024 | Feb 9, 2021 |
| Huawei Euleros 2_0_sp5 | — | — | May 19, 2021 | Feb 9, 2021 |
| Huawei Euleros 2_0_sp8 | — | Upgrade python3-pyyamlUpgrade python2-pyyaml | Feb 2, 2021 | Feb 1, 2021 |
| Huawei Euleros 2_0_sp9 | — | Upgrade python3-pyyaml | Jun 2, 2021 | Feb 9, 2021 |
| Oracle Solaris | — | Upgrade library/python/pyyaml-34 to version 5.3.1-11.4.23.0.1.69.1 on Solaris 11.4Upgrade library/python/pyyaml-35 to version 5.3.1-11.4.23.0.1.69.1 on Solaris 11.4Upgrade legacy/library/python/pyyaml-34 to version 5.3.1-11.4.23.0.1.69.1 on Solaris 11.4Upgrade library/python/pyyaml to version 5.3.1-11.4.23.0.1.69.1 on Solaris 11.4Upgrade library/python/pyyaml-27 to version 5.3.1-11.4.23.0.1.69.1 on Solaris 11.4Upgrade library/python/pyyaml-39 to version 5.4.1-11.4.33.0.1.94.0 on Solaris 11.4Upgrade legacy/library/python/pyyaml-35 to version 5.3.1-11.4.23.0.1.69.1 on Solaris 11.4Upgrade library/python/pyyaml-37 to version 5.3.1-11.4.23.0.1.69.1 on Solaris 11.4 | Mar 17, 2021 | Feb 9, 2021 |
| Oracle_linux | — | Upgrade python38-asn1cryptoUpgrade python38-wheelUpgrade python38-wheel-wheelUpgrade python38-libsUpgrade python38-pip-wheelUpgrade python38-psycopg2Upgrade python38-pycparserUpgrade python38-markupsafeUpgrade python38-psycopg2-docUpgrade python38-requestsUpgrade python38-cffiUpgrade python38-pytzUpgrade python38-numpy-docUpgrade python38-rpm-macrosUpgrade python38-PyMySQLUpgrade python38-sixUpgrade python38-idnaUpgrade python38-lxmlUpgrade python38-idleUpgrade python38-scipyUpgrade python38-tkinterUpgrade python38-pysocksUpgrade python38-numpy-f2pyUpgrade python38-psycopg2-testsUpgrade python38-cryptographyUpgrade python38-debugUpgrade python38-develUpgrade python38-jinja2Upgrade python38-numpyUpgrade python38-CythonUpgrade python38-chardetUpgrade python38-urllib3Upgrade python38-pyyamlUpgrade python38-setuptoolsUpgrade python38-pipUpgrade python38-plyUpgrade python38-mod_wsgiUpgrade python38-testUpgrade python38-babelUpgrade python38Upgrade python38-psutilUpgrade python38-setuptools-wheel | Jul 2, 2021 | Jul 22, 2020 |
| Redhat_linux | — | Upgrade numpy-debugsourceUpgrade python38-wcwidthUpgrade python38-numpyUpgrade python38-Cython-debuginfoUpgrade python38-scipy-debuginfoUpgrade python38-pipUpgrade python38-sixUpgrade python38-more-itertoolsUpgrade python38-babelUpgrade python38-setuptools-wheelUpgrade python38-markupsafeUpgrade python38-chardetUpgrade python38-setuptoolsUpgrade python38-jinja2Upgrade python38-lxml-debuginfoUpgrade python38-psutilUpgrade python38-psycopg2-testsUpgrade python38-pyUpgrade python38-numpy-debuginfoUpgrade scipy-debugsourceUpgrade python38-mod_wsgiUpgrade python38-scipyUpgrade Cython-debugsourceUpgrade python-psutil-debugsourceUpgrade python38-pip-wheelUpgrade python38-cffi-debuginfoUpgrade python38-pyyaml-debuginfoUpgrade python38-cryptographyUpgrade python38-attrsUpgrade python38-plyUpgrade PyYAML-debugsourceUpgrade python38Upgrade python38-psycopg2-debuginfoUpgrade python-lxml-debugsourceUpgrade python38-urllib3Upgrade python38-CythonUpgrade python38-debugsourceUpgrade python38-testUpgrade python-psycopg2-debugsourceUpgrade python38-packagingUpgrade python38-numpy-docUpgrade python38-cffiUpgrade python38-pytestUpgrade python38-idleUpgrade python38-debugUpgrade python38-lxmlUpgrade python38-pysocksUpgrade python38-wheel-wheelUpgrade python38-markupsafe-debuginfoUpgrade python-cffi-debugsourceUpgrade python38-pyyamlUpgrade python38-tkinterUpgrade python38-debuginfoUpgrade python38-psycopg2-docUpgrade python38-asn1cryptoUpgrade python38-libsUpgrade python38-requestsUpgrade python38-atomicwritesUpgrade python38-cryptography-debuginfoUpgrade python38-numpy-f2pyUpgrade python-markupsafe-debugsourceUpgrade python38-rpm-macrosUpgrade python38-pyparsingUpgrade python38-pytzUpgrade python38-PyMySQLUpgrade python-cryptography-debugsourceUpgrade python38-idnaUpgrade python38-wheelUpgrade python38-develUpgrade python38-psycopg2Upgrade python38-pycparserUpgrade python38-psutil-debuginfoUpgrade python38-pluggy | Jun 30, 2021 | Feb 9, 2021 |
| Rocky_linux | — | Upgrade python38-libsUpgrade python38-scipy-debuginfoUpgrade python38-psutil-debuginfoUpgrade python38-psutilUpgrade python38-psycopg2-testsUpgrade python38-develUpgrade python38-mod_wsgiUpgrade python38-testUpgrade numpy-debugsourceUpgrade python38-tkinterUpgrade python38-Cython-debuginfoUpgrade python38-psycopg2Upgrade python38-debugUpgrade python38-cffi-debuginfoUpgrade scipy-debugsourceUpgrade python38-psycopg2-docUpgrade python-psycopg2-debugsourceUpgrade python38-cffiUpgrade python-psutil-debugsourceUpgrade Cython-debugsourceUpgrade python38-numpyUpgrade python38-debugsourceUpgrade python38-psycopg2-debuginfoUpgrade python38-pyyaml-debuginfoUpgrade python38-numpy-debuginfoUpgrade python38-idleUpgrade python38-numpy-f2pyUpgrade python-markupsafe-debugsourceUpgrade python38-debuginfoUpgrade python38-cryptographyUpgrade python38Upgrade python38-CythonUpgrade python-lxml-debugsourceUpgrade python38-scipyUpgrade python38-lxml-debuginfoUpgrade python38-lxmlUpgrade python-cffi-debugsourceUpgrade python38-pyyamlUpgrade PyYAML-debugsourceUpgrade python38-markupsafeUpgrade python38-markupsafe-debuginfoUpgrade python38-cryptography-debuginfoUpgrade python-cryptography-debugsource | May 5, 2022 | Feb 9, 2021 |
| Suse | — | Upgrade python2-pyyamlUpgrade python-pyyamlUpgrade python3-pyyaml | Mar 31, 2021 | Feb 9, 2021 |
| Ubuntu | — | Upgrade python3-yamlUpgrade python-yaml | May 11, 2021 | Feb 9, 2021 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Feb 9, 2021 |
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