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Last updated: April 29, 2026
Why this module. “Shift-left” — find security issues earlier — became dogma. But shift-left has limits: bugs ship anyway, dependencies have CVEs you can’t anticipate, attackers find new exploits. Modern teams add “shift-right” — runtime detection and response — without abandoning shift-left.
Why this module. “Shift-left” — find security issues earlier — became dogma. But shift-left has limits: bugs ship anyway, dependencies have CVEs you can’t anticipate, attackers find new exploits. Modern teams add “shift-right” — runtime detection and response — without abandoning shift-left.
Where shift-left fails
- Zero-day exploits — by definition unknowable at build time
- Configuration drift — code reviewed; production config differs
- Behavioural attacks — credential stuffing, scraping, fraud — code is fine; attackers exploit business logic
- Compromised dependencies — dependency was clean when added; turned malicious in update
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