| Package | Affected versions | Patched versions |
|---|---|---|
| contracts | ≥ 4.3.0, < 4.7.2 | 4.7.2 |
| contracts upgradeable | ≥ 4.3.0, < 4.7.2 | 4.7.2 |
| @openzeppelin/contracts | ≥ 4.3.0, < 4.7.2 | 4.7.2 |
| @openzeppelin/contracts-upgradeable | ≥ 4.3.0, < 4.7.2 | 4.7.2 |
This issue concerns instances of Governor that use the module GovernorVotesQuorumFraction, a mechanism that determines quorum requirements as a percentage of the voting token's total supply. In affected instances, when a proposal is passed to lower the quorum requirement, past proposals may become executable if they had been defeated only due to lack of quorum, and the number of votes it received meets the new quorum requirement.
Analysis of instances on chain found only one proposal that met this condition, and we are actively monitoring for new occurrences of this particular issue.
This issue has been patched in v4.7.2.
Avoid lowering quorum requirements if a past proposal was defeated for lack of quorum.
https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3561
If you have any questions or comments about this advisory, or need assistance deploying the fix, email us at [email protected].
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free