{"id":"GHSA-q4h9-46xg-m3x9","summary":"UUPSUpgradeable vulnerability in @openzeppelin/contracts-upgradeable","details":"### Impact\n\nUpgradeable contracts using `UUPSUpgradeable` may be vulnerable to an attack affecting uninitialized implementation contracts. We will update this advisory with more information soon.\n\n### Patches\n\nA fix is included in version 4.3.2 of `@openzeppelin/contracts` and `@openzeppelin/contracts-upgradeable`.\n\n### Workarounds\n\nInitialize implementation contracts using `UUPSUpgradeable` by invoking the initializer function (usually called `initialize`). An example is provided [in the forum](https://forum.openzeppelin.com/t/security-advisory-initialize-uups-implementation-contracts/15301).\n\n### References\n\nA post-mortem will be published in a few days in the [OpenZeppelin Forum](https://forum.openzeppelin.com/).\n\n### For more information\n\nIf you have any questions or comments about this advisory, or need assistance executing the mitigation, email us at security@openzeppelin.com.","modified":"2021-09-14T22:17:40Z","published":"2021-09-15T20:22:13Z","database_specific":{"nvd_published_at":null,"cwe_ids":[],"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2021-09-14T22:17:40Z"},"references":[{"type":"WEB","url":"https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/security/advisories/GHSA-q4h9-46xg-m3x9"},{"type":"PACKAGE","url":"https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable"}],"affected":[{"package":{"name":"@openzeppelin/contracts-upgradeable","ecosystem":"npm","purl":"pkg:npm/%40openzeppelin/contracts-upgradeable"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.1.0"},{"fixed":"4.3.2"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/09/GHSA-q4h9-46xg-m3x9/GHSA-q4h9-46xg-m3x9.json"}}],"schema_version":"1.9.0"}