CVE-2017-18342: Fedoraproject Fedora

Critical severity, CVSS 9.8. EPSS: 5.7% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 28 only; version 29 only; version 30 only
• Pyyaml Pyyaml: before 5.1 (fixed in 5.1)

Published 2018-06-27. Last modified 2026-06-17.