CVE-2019-20477
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2019-20477
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-20477.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2019-20477
- Aliases
- Downstream
- Related
- Published
- 2020-02-19T04:15:10Z
- Modified
- 2025-08-09T20:01:25Z
- Severity
-
- 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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
-
- https://github.com/yaml/pyyaml/blob/master/CHANGES
- https://www.exploit-db.com/download/47655
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/33VBUY73AA6CTTYL3LRWHNFDULV7PFPN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/52N5XS73Z5S4ZN7I7R56ICCPCTKCUV4H/
- https://security-tracker.debian.org/tracker/CVE-2019-20477
Affected packages
Debian:11 / pyyaml
Package
- Name
- pyyaml
- Purl
- pkg:deb/debian/pyyaml?arch=source
Debian:12 / pyyaml
Package
- Name
- pyyaml
- Purl
- pkg:deb/debian/pyyaml?arch=source
Debian:13 / pyyaml
Package
- Name
- pyyaml
- Purl
- pkg:deb/debian/pyyaml?arch=source
Debian:14 / pyyaml
Package
- Name
- pyyaml
- Purl
- pkg:deb/debian/pyyaml?arch=source