Most recent entries from all

EUVD-2026-31606

2026-10-06T16:28:12.507080+00:00

EUVD-2026-31606

fkie_cve-2021-41264

2026-10-06T16:28:12.507139+00:00

OpenZeppelin Contracts is a library for smart contract development. In affected versions upgradeable contracts using `UUPSUpgradeable` may be vulnerable to an attack affecting uninitialized implementation contracts. A fix is included in version 4.3.2 of `@openzeppelin/contracts` and `@openzeppelin/contracts-upgradeable`. For users unable to upgrade; 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).

GHSA-5vp3-v4hc-gx76 — UUPSUpgradeable vulnerability in @openzeppelin/contracts

2026-10-06T16:28:12.507185+00:00

Affected: npm: @openzeppelin/contracts, npm: @openzeppelin/contracts-upgradeable

### 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

[Post-mortem](https://forum.openzeppelin.com/t/uupsupgradeable-vulnerability-post-mortem/15680).

### 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.

gsd-2021-41264

2026-10-06T16:28:12.507237+00:00

gsd-2021-41264