Open-Source Security Intelligence

Know every vulnerability
before it knows you.

DevGuard continuously monitors your dependencies and alerts you when CVEs like this one affect your stack — with real-time threat intelligence built for developers.

Checkout DevGuard View on GitHub

GHSA-7j52-6fjp-58gr

Published Mar 14, 2022·Last modified Mar 14, 2022

Affected Components(0)

No affected components available

Description

Impact

The storage layout of the ERC2771ContextUpgradeable is not constant between versions.

versions 4.0.0, 4.1.0 and 4.2.0, the contract has a length of 51 slots.
since 4.3.0, the contract has a length of 50 slots
future versions will continue using 50 slots.

This difference in layout could result in breaking upgrades if someone upgrades from an affected version to a non-affected version. It is thus recommended to be extremely careful when upgrading from a contract that uses ERC2771ContextUpgradeable <4.3.0 to a newer version that uses >=4.3.0.

We've assessed the instances of this contract found on chain (with publicly verified source code) and notified the corresponding teams of the risk that an upgrade could cause.

Workarounds

Potentially breaking upgrades would be caught by the OpenZeppelin Upgrades Plugins for Hardhat and Truffle. It is recommended to use this tooling for all your upgrades.

If you need to upgrade to a newer version of the Upgradeable Contracts library, we recommend copying the previous implementation ERC2771ContextUpgradeable (available in the release-4.2 branch) and packaging it with your code.

Reference

https://github.com/OpenZeppelin/openzeppelin-transpiler/pull/86

For more information

If you have any questions, comments, or need assistance regarding this advisory, email us at security@openzeppelin.com.

To submit security reports please use our bug bounty on Immunefi.

Risk Scores

Base Score

0.0

Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.

Threat Intelligence

0.0

No exploitation activity has been observed at this time. Continue routine monitoring.

EPSS

N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit

Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Scan your project

Continuously monitor your dependencies and get alerted when vulnerabilities like this one affect your stack.