Description
express-mock-middleware through 0.0.6 is vulnerable to Prototype Pollution. Exported functions by the package can be tricked into adding or modifying properties of the `Object.prototype`. Exploitation of this vulnerability requires creation of a new directory where an attack code can be placed which will then be exported by `express-mock-middleware`. As such, this is considered to be a low risk.
Remediation
References
https://github.com/LingyuCoder/express-mock-middleware/blob/master/lib/index.js#L39
https://snyk.io/vuln/SNYK-JS-EXPRESSMOCKMIDDLEWARE-564120
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