Auditing Solana CPI Chains: How Static Analysis Tools Catch the Vulnerabilities That Manual Review Misses

Cross-Program Invocations (CPIs) are Solana's superpower — and its most dangerous attack surface. In Q1 2026 alone, CPI-related vulnerabilities contributed to over $40M in losses across protocols like Step Finance, Remora Markets, and several undisclosed audit findings on Cantina and Sherlock. The problem? CPI chains create implicit trust relationships that human auditors routinely miss. A program that's perfectly secure in isolation becomes exploitable when an untrusted program is invoked with forwarded signer privileges. This guide compares the three leading static analysis approaches for catching CPI vulnerabilities in Anchor programs, with real detection examples from 2026 audits. Why CPI Vulnerabilities Are Hard to Catch Manually Consider this innocent-looking instruction: pub fn swap_via_amm ( ctx : Context < SwapViaAmm > , amount : u64 ) -> Result < () > { let cpi_accounts = Transfer { from : ctx .accounts.user_token_account .to_account_info (), to : ctx .accounts.pool_token_acc