Vulnerability Description
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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pyyaml | Pyyaml | >= 5.1, <= 5.1.2 |
| Fedoraproject | Fedora | 30 |
Related Weaknesses (CWE)
References
- https://github.com/yaml/pyyaml/blob/master/CHANGESRelease NotesThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.exploit-db.com/download/47655ExploitThird Party AdvisoryVDB Entry
- https://github.com/yaml/pyyaml/blob/master/CHANGESRelease NotesThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.exploit-db.com/download/47655ExploitThird Party AdvisoryVDB Entry
FAQ
What is CVE-2019-20477?
CVE-2019-20477 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ex...
How severe is CVE-2019-20477?
CVE-2019-20477 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2019-20477?
Check the references section above for vendor advisories and patch information. Affected products include: Pyyaml Pyyaml, Fedoraproject Fedora.