Description
vega-util prior to 1.13.1 allows manipulation of object prototype. The 'vega.mergeConfig' method within vega-util could be tricked into adding or modifying properties of the Object.prototype.
Remediation
References
https://github.com/vega/vega/commit/8f33a0b5170d7de4f12fc248ec0901234342367b
https://snyk.io/vuln/SNYK-JS-VEGAUTIL-559223
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