bnb-chain/bsc v1.7.1 | Chain Release Info

Mandatory Update: BSC v1.7.1 is a mandatory release for all Chapel testnet users. This update prepares the network for the Osaka/Mendel hardfork, scheduled for March 24, 2026, at 02:30 AM UTC. All nodes must be upgraded before this time to remain in sync with the network.

The upgrade process is a simple binary replacement. Please ensure the 'JournalFileEnabled' field is removed from your configuration file.

Osaka/Mendel Hardfork Features

This release activates several key BEPs as part of the hardfork:

BEP-657 (Blob Fee Market Fix): To restore proper fee market dynamics for blobs, this update restricts the inclusion of blob transactions to every 5 blocks. This counteracts the effect of BSC's fast block times, which had caused the blob base fee to consistently stay at the minimum floor price, preventing the EIP-4844 fee mechanism from functioning correctly.
BEP-655 & BEP-652 (MEV and Gas Limit Enhancements): Implements EIP-7934 to add a block size check for MEV bids and EIP-7825 to cap transaction gas limits, improving network stability and resource management.
EIP-7918 Disabled: This EIP is disabled for BSC because it is not applicable due to BSC's zero base fee design.

Key Bug Fixes and Improvements

Critical Stability Fix: A crucial bug has been fixed that could lead to bad blocks. The issue occurred when using optimized opcodes (superinstruction), where a `STATICCALL` could incorrectly allow state-changing operations, leading to consensus failures.
Fee History API Fix: An issue that caused the `eth_feeHistory` RPC method to incorrectly return only one block of data has been resolved.
Sync and Security Enhancements: Includes several important fixes from upstream go-ethereum:
- A fix for a potential infinite loop in the RLP iterator that could be used as a P2P Denial-of-Service vector.
- A fix to prevent snap sync from stalling by correctly managing peers after a request timeout.
- Upgraded the `otel` dependency to fix security vulnerability CVE-2026-24051.
Receipt Fix for Validators: Corrects a bug where the transaction index (`Log.TxIndex`) in receipts was incorrect for transactions following a blob transaction. This issue only affected the validator that produced the block.
Tracing API Fix: The trace API has been fixed to correctly handle system transactions, which were previously failing gas limit checks during replay.

## MetaInfo

Mandatory Update Required: YES
Target Audience: all Chapel testnet users
Procedure: simply binary replacement should be good (ensure no 'JournalFileEnabled' field in config file)
Schedule(Timeline): before 2026-03-24 02:30:00 AM UTC

## Changelog

v1.7.1 is for BSC Chapel testnet [Osaka/Mendel hardfork](https://github.com/bnb-chain/BEPs/blob/master/BEPs/BEP-658.md),the hard fork time is 2026-03-24 02:30:00 AM UTC

### FEATURE
- [feat: support bid block size check for BEP-655](https://github.com/bnb-chain/bsc/pull/3529)
- [feat: support mev bid gas check of bep 652](https://github.com/bnb-chain/bsc/pull/3528)
- [eip4844.go: disable eip-7918 for bsc](https://github.com/bnb-chain/bsc/pull/3531)
- [feat: implement BEP-657 - Limit Blob Transaction Inclusion by Block Number](https://github.com/bnb-chain/bsc/pull/3533)

### BUGFIX
- [core/types: fix typo in vote comparison (#3573)](https://github.com/bnb-chain/bsc/pull/3573)
- [Fee history issue](https://github.com/bnb-chain/bsc/pull/3577)
- [go.mod: upgrade otel to fix CVE-2026-24051](https://github.com/bnb-chain/bsc/pull/3554)
- [fix: fix gaslimit check in trace api (#3580)](https://github.com/bnb-chain/bsc/pull/3580)
- [miner: fix missing tcount increment in commitBlobTransaction (#3581)](https://github.com/bnb-chain/bsc/pull/3581)
- [fix: superinstruction bad block (#3582)](https://github.com/bnb-chain/bsc/pull/3582)
- [core/vm: align super-instruction minStack and maxStack bounds (#3584)](https://github.com/bnb-chain/bsc/pull/3584)
- [rlp: finalize listIterator on parse error to prevent non-advancing loops (#3586)](https://github.com/bnb-chain/bsc/pull/3586)
- [eth/protocols/snap: restore peers to idle pool on request revert (#3587)](https://github.com/bnb-chain/bsc/pull/3587)



## Assets

|    Assets    | Sha256 Checksum  |
| :-----------: |------------|
| mainnet.zip | 522cb9902437df2368008b28bebb6b5c35ec026bf2ec41af40117ff507f53fa7 |
| testnet.zip | 0d9de8b7f1bafc36711eed80e97bf33f906fadc2ceb5457361645941d7ad19f7 |
| geth_linux | 8d8000c0236c04ad781ca3589c1dc06e68b6a0b1ade68d26700c96cdb36c32d7 |
| geth_mac  | 34909b2384adf12b91d427dba876bc04ae8a952730004b2a49a2ce06e580f83a |
| geth_windows  | 828700ed688c7617618a9f489a420fb82c87a475d7ea3fb8ed66fdb4141d59d5 |
| geth_linux_arm64  | 6ad1e71f5cfca70a98f106c2be3021235e9a867a4e39f98156f10cff8ec5172e |

Chain Releases

bnb-chain/bsc - v1.7.1 New

Release Summary

Osaka/Mendel Hardfork Features

Key Bug Fixes and Improvements

Release Notes

Links