{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "realms-shim"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": true,
    "github_reviewed_at": "2020-06-16T21:22:25Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "Versions of `realms-shim` prior to 1.2.1 are vulnerable to a Sandbox Breakout. The Realms evaluation function has an option to apply Babel-like transformations to the source code before it reaches the evaluator. One portion of this transform pipeline exposed a primal-Realm object to the rewriting function. Confined code which used the evaluator itself could provide a malicious rewriter function that captured this object, and use it to breach the sandbox.\n\n\n## Recommendation\n\nUpgrade to version 1.2.1 or later.",
  "id": "GHSA-7cg8-pq9v-x98q",
  "modified": "2021-09-02T21:14:19Z",
  "published": "2019-10-21T21:58:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Agoric/realms-shim/security/advisories/GHSA-7cg8-pq9v-x98q"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Agoric/realms-shim"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-7cg8-pq9v-x98q"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-JS-REALMSSHIM-536069"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/advisories/1218"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Sandbox Breakout in realms-shim"
}