Update - Public v1.5.3 release is available, please update your nodes as soon as possible.
Nov 05, 2026 - 17:52 UTC
Nov 05, 2026 - 17:52 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Nov 05, 2026 - 16:19 UTC
Nov 05, 2026 - 16:19 UTC
Scheduled - Summary
We identified an issue that could cause Base nodes to calculate an incorrect state root. We’ve verified the current state root is correct and users were not affected. We immediately fixed the Base block builders and released the patch to all node operators.
What happened
On November 4, 2026, a bug was discovered in Reth that could, in some cases, make a node compute an incorrect state root. The upstream fix is github.com/paradigmxyz/reth/pull/28264. Base is built on Reth, so we applied the same mitigation immediately.
What we did
- Verified the chain. We recomputed the state root and confirmed it is correct.
- Relied on our proof system as a second check. Base's proof system uses an independent implementation to verify every state root, so it would have caught a mismatch like this.
- We patched all builder nodes the same day, so no new blocks could be impacted.
- Shipped a fix to prevent base validators halting on invalid state roots in v1.5.3.
Action for node operators
We recommend upgrading to v1.5.3. This removes the halt risk described above. You don't need to resync or take any other action.
github.com/base/base/releases/v1.5.3
Nov 5, 2026 16:19 - Nov 7, 2026 16:19 UTC
We identified an issue that could cause Base nodes to calculate an incorrect state root. We’ve verified the current state root is correct and users were not affected. We immediately fixed the Base block builders and released the patch to all node operators.
What happened
On November 4, 2026, a bug was discovered in Reth that could, in some cases, make a node compute an incorrect state root. The upstream fix is github.com/paradigmxyz/reth/pull/28264. Base is built on Reth, so we applied the same mitigation immediately.
What we did
- Verified the chain. We recomputed the state root and confirmed it is correct.
- Relied on our proof system as a second check. Base's proof system uses an independent implementation to verify every state root, so it would have caught a mismatch like this.
- We patched all builder nodes the same day, so no new blocks could be impacted.
- Shipped a fix to prevent base validators halting on invalid state roots in v1.5.3.
Action for node operators
We recommend upgrading to v1.5.3. This removes the halt risk described above. You don't need to resync or take any other action.
github.com/base/base/releases/v1.5.3
Nov 5, 2026 16:19 - Nov 7, 2026 16:19 UTC
Verifying - Denim has successfully activated.
We are currently investigating periodic transaction inclusion delays, causing a higher than expected rate of empty blocks.
Nov 05, 2026 - 18:14 UTC
We are currently investigating periodic transaction inclusion delays, causing a higher than expected rate of empty blocks.
Nov 05, 2026 - 18:14 UTC
In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary.
Nov 05, 2026 - 18:00 UTC
Nov 05, 2026 - 18:00 UTC
Scheduled - On Thursday, November 5th at 18:00 UTC (Unix timestamp 1793901600), Base Mainnet will undergo the Denim upgrade.
Base Mainnet is expected to remain operational during the upgrade window.
Operators of Base Mainnet nodes must upgrade to base/base v1.5.1 before activation:
https://github.com/base/base/releases/tag/v1.5.1
Operators upgrading from an older release must remove --enable-experimental-validity-transactions from their base-reth-node command if present, or the node will fail to start. Please review the release notes for additional configuration changes.
For more information on the Denim upgrade:
https://docs.base.org/upgrades/denim/overview
Nov 5, 2026 18:00-20:00 UTC
Base Mainnet is expected to remain operational during the upgrade window.
Operators of Base Mainnet nodes must upgrade to base/base v1.5.1 before activation:
https://github.com/base/base/releases/tag/v1.5.1
Operators upgrading from an older release must remove --enable-experimental-validity-transactions from their base-reth-node command if present, or the node will fail to start. Please review the release notes for additional configuration changes.
For more information on the Denim upgrade:
https://docs.base.org/upgrades/denim/overview
Nov 5, 2026 18:00-20:00 UTC
Monitoring - A fix has been implemented and we are monitoring the results.
Nov 02, 2026 - 14:55 UTC
Nov 02, 2026 - 14:55 UTC
Update - We are continuing to work on a fix for this issue.
Nov 02, 2026 - 14:37 UTC
Nov 02, 2026 - 14:37 UTC
Identified - We've identified the performance degradation and have deployed optimizations. We're continuing to monitor the situation.
Nov 02, 2026 - 14:36 UTC
Nov 02, 2026 - 14:36 UTC
Investigating - We are investigating reports of slower than usual transaction inclusion on Base Mainnet. Blocks continue to be produced normally. Some transactions may take longer than usual to appear in a block or preconfirmation. We will provide an update as we learn more.
Nov 02, 2026 - 13:36 UTC
Nov 02, 2026 - 13:36 UTC
Mainnet
Degraded Performance
Public RPC API
Operational
Deposits
Operational
Withdrawals
Operational
Batch submission
Operational
Block production
Operational
Flashblocks
Operational
Transaction pool
Degraded Performance
Snapshots
Operational
Client Software
Operational
Testnet
Under Maintenance
Public RPC API
Operational
Deposits
Operational
Withdrawals
Operational
Batch submission
Operational
Block production
Operational
Flashblocks
Operational
Transaction pool
Operational
Snapshots
Operational
Client Software
Under Maintenance
Bridge (Mainnet)
Operational
Bridge (Testnet)
Operational
Website
Operational
Homepage
Operational
Docs
Operational
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.