There are Lido V3 codebase audits published on the audits repository:
- Consensys Diligence [diligence.security]
- MixBytes [mixbytes.io]
- Certora [certora.com]
- Composable Security [composable-security.com]
All audits with total issues and statuses are published at https://docs.lido.fi/security/audits.