Preface: Swift is memory-safe by default. Unlike C, your enum and String cannot “overflow” a buffer and crash the app unless you use the Unsafe prefix.
Background: Swift is memory-safe by default. Use Enums to represent mutually exclusive states (e.g., loading, success, error) to eliminate “impossible” states. [.]onAppear { manager.fetchData() } will run every time the view appears, meaning every time SwiftUI reconstructs or re‑displays this DataView, it triggers fetchData() again.\ This can lead to multiple overlapping async calls unless explicitly prevented. The enum-based state machine helps protect against impossible logical states, but it does not prevent multiple requests from firing. Swift’s memory safety doesn’t stop logical repetition or resource exhaustion.
Ref: In Swift, “checking the bounds of a memory buffer” typically refers to ensuring you don’t access memory outside of an allocated range (like an Array or UnsafeBufferPointer).
Vulnerability details: CVE-2026-20700 A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 26.3, tvOS 26.3, macOS Tahoe 26.3, visionOS 26.3, iOS 26.3 and iPadOS 26.3. An attacker with memory write capability may be able to execute arbitrary code. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 26. CVE-2025-14174 and CVE-2025-43529 were also issued in response to this report.
Official announcement: Please refer to the link for details – https://nvd.nist.gov/vuln/detail/CVE-2026-20700