UBUNTU-CVE-2019-20477

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Source
https://ubuntu.com/security/CVE-2019-20477
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-20477.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2019-20477
Upstream
Withdrawn
2025-07-18T16:45:35Z
Published
2020-02-19T04:15:00Z
Modified
2025-07-16T07:39:57.034932Z
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
  • Ubuntu - low
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

Affected packages

Ubuntu:20.04:LTS / pyyaml

Package

Name
pyyaml
Purl
pkg:deb/ubuntu/pyyaml@5.3-1ubuntu2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.3-1ubuntu2

Affected versions

5.*

5.1.2-1
5.1.2-1build1
5.3-1ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "5.3-1ubuntu2",
            "binary_name": "python-yaml"
        },
        {
            "binary_version": "5.3-1ubuntu2",
            "binary_name": "python-yaml-dbg"
        },
        {
            "binary_version": "5.3-1ubuntu2",
            "binary_name": "python3-yaml"
        },
        {
            "binary_version": "5.3-1ubuntu2",
            "binary_name": "python3-yaml-dbg"
        }
    ]
}