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GHSA-3pqx-4fqf-j49f

Deserialization of Untrusted Data in PyYAML

Source: GitHub Advisory Database (reviewed) Critical CVE-2019-20477

Packages

EcosystemPackageAffectedFixed in
PyPI pyyaml >= 5.1, < 5.2 5.2

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.