GHSA-q4h9-46xg-m3x9

UUPSUpgradeable vulnerability in @openzeppelin/contracts-upgradeable

Published 15 Sep 2021Modified 14 Sep 2021

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

No source gives a CVSS score.

Trivy's own label is CRITICAL. Rated critical by GHSA.

Description

### Impact Upgradeable contracts using `UUPSUpgradeable` may be vulnerable to an attack affecting uninitialized implementation contracts. We will update this advisory with more information soon. ### Patches A fix is included in version 4.3.2 of `@openzeppelin/contracts` and `@openzeppelin/contracts-upgradeable`. ### Workarounds Initialize 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). ### References A post-mortem will be published in a few days in the [OpenZeppelin Forum](https://forum.openzeppelin.com/). ### For more information If you have any questions or comments about this advisory, or need assistance executing the mitigation, email us at security@openzeppelin.com.

Affected packages and fixed versions

Source	Package	Fixed in
npm::GitHub Security Advisory npm	@openzeppelin/contracts-upgradeable	4.3.2

References

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