Skip to content
Thoughtful, detailed coverage of everything Apple for 33 years
and the TidBITS Content Network for Apple professionals
3 comments

Security Update 2017-001 (Yosemite and El Capitan)

Apple has released Security Update 2017-001 for OS X 10.10 Yosemite and 10.11 El Capitan, bringing a few select patches from the macOS 10.12.4 Sierra release to the two older operating systems (see “Apple Releases macOS 10.12.4, watchOS 3.2, and tvOS 10.2,” 27 March 2017). The security update addresses a memory corruption issue in both systems that could allow a maliciously crafted JPEG file to arbitrarily execute code, as well as a timing side channel issue that affected El Capitan that could leak sensitive user information. (Free. For 10.10.5 Yosemite, 495.2 MB; for 10.11.6 El Capitan,
700.6 MB; security content release notes)

Subscribe today so you don’t miss any TidBITS articles!

Every week you’ll get tech tips, in-depth reviews, and insightful news analysis for discerning Apple users. For over 33 years, we’ve published professional, member-supported tech journalism that makes you smarter.

Registration confirmation will be emailed to you.

This site is protected by reCAPTCHA. The Google Privacy Policy and Terms of Service apply.

Comments About Security Update 2017-001 (Yosemite and El Capitan)