The Standard

Summary

Chainlink recommends that users using price oracles, check whether the Arbitrum Sequencer is active. If the sequencer goes down, the index oracles may have stale prices, since L2-submitted transactions (i.e. by the aggregating oracles) will not be processed.

Vulnerability Details

The Chainlink docs on L2 Sequencer Uptime Feeds specify more details.

Impact

If the Arbitrum sequencer were to go offline the Chainlink oracle may return an invalid/stale price. It should always be checked before consuming any data from Chainlink.

Tools Used

Manual review

Recommendations

Check if the sequencer is up before consuming any price data.