Sysvar Cache Staleness Remediation
Overview
Related Detector: Sysvar Cache Staleness
Cached sysvar values can become stale during execution. The fix is to read sysvars close to the point of use rather than caching them early in execution.
Recommended Fix
// Read sysvar immediately before use
let clock = Clock::get()?;
require!(clock.unix_timestamp <= deadline, Expired);Common Mistakes
Mistake: Caching at Function Entry
// WRONG: cached at entry, used after CPI
let clock = Clock::get()?;
invoke(&external_ix, accounts)?;
// Clock value may not reflect current time accurately
require!(clock.unix_timestamp <= deadline, Expired);Re-read after CPI if timing is critical.