{"id":"GHSA-q4h9-46xg-m3x9","aliases":[],"status":"published","title":"UUPSUpgradeable vulnerability in @openzeppelin/contracts-upgradeable","description":"### 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.","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2021-09-15T20:22:13Z","modified":"2023-01-09T05:05:18Z","fixes":[{"ecosystem":"npm","package":"@openzeppelin/contracts-upgradeable","fixed_in":["4.3.2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@openzeppelin/contracts-upgradeable","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.1.0"},{"fixed":"4.3.2"}]}]},{"source":"osv","ecosystem":"npm","package":"@openzeppelin/contracts-upgradeable","ranges":[{"type":"SEMVER","events":[{"introduced":"4.1.0"},{"fixed":"4.3.2"}]}]}],"references":[{"url":"https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/security/advisories/GHSA-q4h9-46xg-m3x9","tags":["web"]},{"url":"https://github.com/advisories/GHSA-q4h9-46xg-m3x9"},{"url":"https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-q4h9-46xg-m3x9","title":"UUPSUpgradeable vulnerability in @openzeppelin/contracts-upgradeable","description":"### 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.","status":"published","published":"2021-09-15T20:22:13Z","modified":"2023-01-09T05:05:18Z","updated_at":"2026-11-02T14:36:11.367194Z"}],"osv":[{"id":"GHSA-q4h9-46xg-m3x9","title":"UUPSUpgradeable vulnerability in @openzeppelin/contracts-upgradeable","description":"### 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.","status":"published","published":"2021-09-15T20:22:13Z","modified":"2021-09-14T22:17:40Z","updated_at":"2026-11-02T15:46:54.055966Z"}]}}