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CVE-2020-1747

PyYAML: arbitrary command execution through python/object/new when FullLoader is used

A vulnerability was discovered in the PyYAML library in versions before 5.3.1, 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. An attacker could use this flaw to execute arbitrary code on the system by abusing the python/object/new constructor.

CVSS 3.1 · 9.8 Critical EPSS 5.4% KEV · Not listed
Vendors
Fedoraproject Opensuse Oracle and 2 more
Products
Fedora Leap Communications Cloud Native Core Network Function Cloud Native Environment and 2 more
CVE-2020-14343

PyYAML: incomplete fix for CVE-2020-1747

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 3.1 · 9.8 Critical EPSS 6.2% KEV · Not listed
Vendors
Oracle Pyyaml Redhat
Products
Communications Cloud Native Core Network Function Cloud Native Environment Pyyaml Enterprise Linux and 2 more
CVE-2019-20477

PyYAML: command execution through python/object/apply constructor in FullLoader

PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and load_all functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342.

CVSS 3.1 · 9.8 Critical EPSS 5.1% KEV · Not listed
Vendors
Fedoraproject Pyyaml Redhat
Products
Fedora Pyyaml Enterprise Linux and 1 more
CVE-2017-18342

PyYAML: yaml.load() API could execute arbitrary code

In PyYAML before 5.1, the yaml.load() API could execute arbitrary code if used with untrusted data. The load() function has been deprecated in version 5.1 and the 'UnsafeLoader' has been introduced for backward compatibility with the function.

CVSS 3.1 · 9.8 Critical EPSS 5.6% KEV · Not listed
Vendors
Fedoraproject Pyyaml
Products
Fedora Pyyaml