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macOS High Sierra Supplemental Update includes security improvements to Safari and WebKit to mitigate the effects of Spectre.

What's New

Version 1.0:
  • Update fixes an issue where using certain character sequences could cause apps to crash
  • Available for: macOS High Sierra 10.13.3.
  • Impact: Processing a maliciously crafted string may lead to heap corruption.
  • Description: A memory corruption issue was addressed through improved input validation.
  • CVE-2018-4124: an anonymous researcher.


  • macOS 10.13.3

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macOS 10.13.3 Supplemental Update User Discussion

1.8 10


Current Version (1.x)


Downloads 22,099
Version Downloads 22,099
License Updater
Date 20 Feb 2018
Platform Intel 64 / OS X
Price Free
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