Security vulnerabilities and automated fixes for semantic vulnerability issues
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A medium-severity vulnerability in Fastlane's `deliver` tool revealed how a subtle semantic distinction between `nil` and an empty array could silently remove an app from sale in every App Store territory worldwide — with no warning, no confirmation, and a misleading success message to cover its tracks. This post breaks down how the bug worked, why it matters, and what developers can learn about defensive coding with destructive operations.