# Neutron Auction and Undelegations Contract, Chain Upgrade (Phase 2, Report 2) security audit

Neutron's v11 Cosmos SDK chain upgrade moves the chain to native governance, replaces x/revenue, x/feeburner and adminmodule with gov, mint and distribution, and migrates the puppeteer CosmWasm contract to auth-proxy.

Codezen audited Neutron Auction and Undelegations Contract, Chain Upgrade (Phase 2, Report 2) together with Oak Security. Technologies in scope: Golang, Rust, Cosmos SDK, CosmWasm and Neutron. We reported 21 findings: 1 critical, 6 major, 6 minor and 8 informational.

- Audit type: Cosmos SDK chain upgrade audit
- Technologies: Golang, Rust, Cosmos SDK, CosmWasm, Neutron
- Ecosystem: Cosmos
- Delivered with: Oak Security
- Report date: 9 April 2026
- Full report (PDF): https://github.com/oak-security/audit-reports/blob/main/Neutron/2026-04-09%20Audit%20Report%20%E2%80%93%20Neutron%20Auction%20and%20Undelegations%20Contract%2C%20Chain%20Upgrade%20(Phase%202%20_%20Report%202).pdf
- Project website: https://neutron.org/
- Page: https://www.codezen.tech/audits/neutron-auction-and-undelegations-phase-2/

## Findings by severity

| Severity | Count |
| --- | --- |
| Critical | 1 |
| Major | 6 |
| Minor | 6 |
| Info | 8 |
| Total | 21 |

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