{"id":"GHSA-q4j7-v27r-fgcx","summary":"Prototype Pollution in realms-shim","details":"All versions of package realms-shim are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector.","aliases":["CVE-2021-23543"],"modified":"2026-03-13T21:57:01.858728Z","published":"2022-01-13T15:00:36Z","database_specific":{"cwe_ids":["CWE-1321"],"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2022-01-11T18:13:17Z","nvd_published_at":"2022-01-10T14:10:00Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-23543"},{"type":"PACKAGE","url":"https://github.com/Agoric/realms-shim"},{"type":"WEB","url":"https://snyk.io/vuln/SNYK-JS-REALMSSHIM-2309908"},{"type":"WEB","url":"https://www.npmjs.com/package/realms-shim"}],"affected":[{"package":{"name":"realms-shim","ecosystem":"npm","purl":"pkg:npm/realms-shim"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.2.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/01/GHSA-q4j7-v27r-fgcx/GHSA-q4j7-v27r-fgcx.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}