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-plyUpgrade python38-sixUpgrade python38-idnaUpgrade python38-CythonUpgrade python38-requestsUpgrade python38-psycopg2-testsUpgrade python38-pluggyUpgrade python38-pytzUpgrade python38-PyMySQLUpgrade python38-packagingUpgrade python38-cffiUpgrade python38-psycopg2-docUpgrade python38-pycparserUpgrade python38-pytestUpgrade python38-asn1cryptoUpgrade python38-scipyUpgrade python38-pyparsingUpgrade python38-psycopg2Upgrade python38-mod_wsgiUpgrade python38-wcwidthUpgrade python38-markupsafeUpgrade python38-attrsUpgrade python38-pyyamlUpgrade python38-atomicwritesUpgrade python38-pysocksUpgrade python38-chardetUpgrade python38-cryptographyUpgrade python38-more-itertoolsUpgrade python38-py | May 4, 2022 | Feb 9, 2021 |
| Alpine Linux | — | Upgrade py3-yaml | Mar 26, 2024 | Feb 9, 2021 |
| Centos_linux | — | Upgrade scipy-debugsourceUpgrade python38-chardetUpgrade python38-pipUpgrade python38-lxmlUpgrade python38-CythonUpgrade python-psycopg2-debugsourceUpgrade python38-lxml-debuginfoUpgrade python38-debugUpgrade python38-asn1cryptoUpgrade python38-jinja2Upgrade python38-rpm-macrosUpgrade python38-debugsourceUpgrade python38-pyyaml-debuginfoUpgrade python38-pysocksUpgrade python38-scipy-debuginfoUpgrade python38-idleUpgrade python-cryptography-debugsourceUpgrade python38-develUpgrade python38-babelUpgrade python38-numpy-debuginfoUpgrade python38-psycopg2-debuginfoUpgrade python38-pyyamlUpgrade python38-sixUpgrade python38-Cython-debuginfoUpgrade python38-plyUpgrade python38-pytzUpgrade Cython-debugsourceUpgrade python38-cffi-debuginfoUpgrade python38-mod_wsgiUpgrade python38-markupsafeUpgrade python38-setuptoolsUpgrade numpy-debugsourceUpgrade python38-markupsafe-debuginfoUpgrade python38-cffiUpgrade python38-libsUpgrade PyYAML-debugsourceUpgrade python-cffi-debugsourceUpgrade python-psutil-debugsourceUpgrade python38-tkinterUpgrade python38-pip-wheelUpgrade python38-urllib3Upgrade python38-numpy-f2pyUpgrade python38-requestsUpgrade python38-psycopg2-docUpgrade python38-cryptography-debuginfoUpgrade python38-cryptographyUpgrade python-lxml-debugsourceUpgrade python38Upgrade python38-setuptools-wheelUpgrade python38-wheelUpgrade python38-scipyUpgrade python38-pycparserUpgrade python38-numpyUpgrade python38-debuginfoUpgrade python38-testUpgrade python38-psycopg2-testsUpgrade python38-wheel-wheelUpgrade python38-PyMySQLUpgrade python38-psycopg2Upgrade python38-numpy-docUpgrade python38-idnaUpgrade python-markupsafe-debugsourceUpgrade python38-psutil-debuginfoUpgrade python38-psutil | 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 py38-yamlUpgrade py36-yamlUpgrade py37-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-37 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 library/python/pyyaml-34 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-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 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 11.4 | Mar 17, 2021 | Feb 9, 2021 |
| Oracle_linux | — | Upgrade python38-testUpgrade python38-urllib3Upgrade python38-psutilUpgrade python38Upgrade python38-chardetUpgrade python38-numpyUpgrade python38-jinja2Upgrade python38-CythonUpgrade python38-setuptools-wheelUpgrade python38-plyUpgrade python38-pyyamlUpgrade python38-mod_wsgiUpgrade python38-setuptoolsUpgrade python38-pipUpgrade python38-babelUpgrade python38-PyMySQLUpgrade python38-lxmlUpgrade python38-rpm-macrosUpgrade python38-idnaUpgrade python38-psycopg2Upgrade python38-requestsUpgrade python38-wheel-wheelUpgrade python38-wheelUpgrade python38-asn1cryptoUpgrade python38-pytzUpgrade python38-numpy-docUpgrade python38-pysocksUpgrade python38-debugUpgrade python38-libsUpgrade python38-idleUpgrade python38-cryptographyUpgrade python38-tkinterUpgrade python38-scipyUpgrade python38-pycparserUpgrade python38-psycopg2-testsUpgrade python38-psycopg2-docUpgrade python38-pip-wheelUpgrade python38-numpy-f2pyUpgrade python38-cffiUpgrade python38-markupsafeUpgrade python38-develUpgrade python38-six | Jul 2, 2021 | Jul 22, 2020 |
| Redhat_linux | — | Upgrade python38-attrsUpgrade Cython-debugsourceUpgrade python-psutil-debugsourceUpgrade python38-setuptools-wheelUpgrade python38-scipyUpgrade python38-babelUpgrade python38-setuptoolsUpgrade python38-lxml-debuginfoUpgrade python38-markupsafeUpgrade python38-jinja2Upgrade python38-sixUpgrade python38-scipy-debuginfoUpgrade python38-numpy-docUpgrade python38-more-itertoolsUpgrade python38-numpyUpgrade python38-chardetUpgrade python38-psutilUpgrade python38-wcwidthUpgrade python38-numpy-debuginfoUpgrade python38-psycopg2-debuginfoUpgrade python38-mod_wsgiUpgrade python38Upgrade python38-Cython-debuginfoUpgrade numpy-debugsourceUpgrade python38-cffi-debuginfoUpgrade python38-pytestUpgrade python38-urllib3Upgrade python38-debugsourceUpgrade python38-cryptographyUpgrade python38-idleUpgrade PyYAML-debugsourceUpgrade python38-pyyaml-debuginfoUpgrade python38-pip-wheelUpgrade python38-pipUpgrade python38-plyUpgrade python38-cffiUpgrade python-psycopg2-debugsourceUpgrade python38-testUpgrade python-lxml-debugsourceUpgrade scipy-debugsourceUpgrade python38-pyUpgrade python38-CythonUpgrade python38-psycopg2-testsUpgrade python38-packagingUpgrade python38-idnaUpgrade python38-wheelUpgrade python38-psutil-debuginfoUpgrade python38-psycopg2-docUpgrade python-cryptography-debugsourceUpgrade python38-cryptography-debuginfoUpgrade python38-requestsUpgrade python38-debugUpgrade python38-rpm-macrosUpgrade python38-pytzUpgrade python38-tkinterUpgrade python38-atomicwritesUpgrade python-cffi-debugsourceUpgrade python38-numpy-f2pyUpgrade python38-wheel-wheelUpgrade python38-pluggyUpgrade python38-pysocksUpgrade python38-pycparserUpgrade python38-debuginfoUpgrade python38-markupsafe-debuginfoUpgrade python38-PyMySQLUpgrade python38-pyparsingUpgrade python38-libsUpgrade python38-lxmlUpgrade python38-pyyamlUpgrade python38-develUpgrade python-markupsafe-debugsourceUpgrade python38-asn1cryptoUpgrade python38-psycopg2 | Jun 30, 2021 | Feb 9, 2021 |
| Rocky_linux | — | Upgrade python38-pyyaml-debuginfoUpgrade python-cryptography-debugsourceUpgrade PyYAML-debugsourceUpgrade python38-cryptographyUpgrade python38Upgrade python38-cryptography-debuginfoUpgrade python38-debuginfoUpgrade python38-markupsafe-debuginfoUpgrade python38-markupsafeUpgrade python38-pyyamlUpgrade python38-numpy-debuginfoUpgrade python38-CythonUpgrade python38-scipyUpgrade python38-idleUpgrade python-markupsafe-debugsourceUpgrade python38-numpy-f2pyUpgrade python38-lxml-debuginfoUpgrade python-cffi-debugsourceUpgrade python38-lxmlUpgrade python-lxml-debugsourceUpgrade python38-cffiUpgrade python38-psycopg2-testsUpgrade python38-psutil-debuginfoUpgrade python38-psycopg2-debuginfoUpgrade python38-libsUpgrade python38-scipy-debuginfoUpgrade python38-psutilUpgrade python38-mod_wsgiUpgrade python-psutil-debugsourceUpgrade python38-numpyUpgrade python38-develUpgrade python38-debugUpgrade python-psycopg2-debugsourceUpgrade Cython-debugsourceUpgrade python38-psycopg2-docUpgrade python38-cffi-debuginfoUpgrade scipy-debugsourceUpgrade numpy-debugsourceUpgrade python38-tkinterUpgrade python38-testUpgrade python38-psycopg2Upgrade python38-debugsourceUpgrade python38-Cython-debuginfo | May 5, 2022 | Feb 9, 2021 |
| Suse | — | Upgrade python2-pyyamlUpgrade python3-pyyamlUpgrade python-pyyaml | Mar 31, 2021 | Feb 9, 2021 |
| Ubuntu | — | Upgrade python-yamlUpgrade python3-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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