macOS Tahoe 26.5.1 Update! Everything you need to know.

macOS Tahoe 26.5.1 (25F80) is now Available For All Users!

UPDATED: 06/02/26

This article will be continually updated as new information comes in.

Apple just released the 3rd minor update for macOS Tahoe to the public! Let’s jump in and find out what’s new.

This update is a very small point release that shows the following notes:

The 26.5.1 Update includes the following:

This update addresses an issue for enterprise users where Macs with an M5 chip could unexpectedly shut down when using certain content filtering network extensions.

This update appears to only fix one issue with M5 Macs. The update is available for ALL macOS Tahoe supported Macs. The update also does not have any published CVE Security fixes listed on Apple’s Security Update page.

macOS Tahoe Patch Notes Summary

1. New Features – 0
2. Developer Documented Fixes – 0
3. Security Fixes – 0
4. Enterprise Fixes – 1
5. Safari Security (Webkit) – 0
6. Safari – No update
7. Full installer & IPSW – Both Released
8. OpenCore Legacy Patcher Users – NOT COMPATIBLE!

OpenCore Legacy Patcher for Unsupported Macs

OCLP 2.4.1 & macOS Tahoe 26.5.1 : DO NOT INSTALL! NOT COMPATIBLE YET. This release is in full testing and it is not recommended that you attempt to install it yet.!

OCLP 2.4.1 Testing Status =

Kernel Debug Kit (KDK) Status: = https://github.com/dortania/KdkSupportPkg/releases

Metallibsupport Status: = https://github.com/dortania/MetallibSupportPkg/releases

Full Apple Update Release list

Update List 💻📲 ✅

Tahoe 26.5.1 release (25F80) (NEW)
Sequoia 15.7.7 release (24G720) (remains the same)
Sonoma 14.8.7 release (23J520) (remains the same)
iOS/iPadOS 26.5.1 release (23F81) (NEW) iPhone 17 & Air ONLY
iOS/iPadOS 18.7.9 release (22H355) (remains the same)
iPadOS 17.7.11 release (21H461) (remains the same)
iOS/iPadOS 16.7.16 release (20H392) (remains the same)
iOS/iPadOS 15.8.8 release (19H422) (remains the same)
watchOS 26.5 release (23T570) (remains the same)
homePodOS 26.5 release (23L471) (remains the same)
tvOS 26.5 release (23L471) (remains the same)
visionOS 26.5 release (23O471) (remains the same)
Studio Display Firmware 26.4 (23E246) (remains the same)
Safari – 26.5 (21624.2.5.11.4)
Xcode – 26.5
Command Line Tools for Xcode – 26.5

Security Vulnerabilities Patched

This is a list of all the CVE Security Vulnerabilities Patched:

Tahoe 26.5.1 – 0 NEW (No CVE’s listed)
Sequoia 15.7.7 – 45 CVEs Patched (Remains same release)
Sonoma 14.8.7 – 42 CVEs Patched (Remains same release)
iOS/iPadOS 26.5.1 -0 NEW (No CVE’s listed)
iOS/iPadOS 18.7.9 – 47 CVEs Patched (Remains same release)
iPadOS 17.7.11 – 1 CVE Patched (Remains same release)
iOS/iPadOS 16.7.16 – 1 CVE Patched (Remains same release)
iOS/iPadOS 15.8.8 – 1 CVE Patched (Remains same release)
watchOS 26.5 – 43 CVEs Patched (Remains same release)
tvOS 26.5 – 46 CVEs Patched (Remains same release)
visionOS 26.5 – 48 CVEs Patched (Remains same release)

This information was provided by MacAdmin Tony Young - Thank You!

NOTE: I hate website ads, but this one small google ad below helps me with the cost of running Mr. Macintosh.com. Thank you

1. macOS Tahoe Apple Links
2. macOS Tahoe Release History
3. macOS Tahoe Full Installer.app
4. Apple Silicon macOS Tahoe IPSW Restore file Database
5. macOS Tahoe Update sizes
6. Apple Silicon System Firmware Version
7. Apple Silicon OS loader Version (iBoot)
8. Intel T2 BridgeOS Update
9. Intel T2 Firmware Update
10. Safari Update
11. What’s new for enterprise in macOS Tahoe
12. Security Content of macOS Tahoe
13. macOS Tahoe Release Notes / Patch Notes / Changes
14. macOS Tahoe Developer Release Notes

Click “Continue Reading” for the rest of the article.

1. Apple macOS Tahoe Links

When Apple releases the official macOS Tahoe support links, they will be listed below.

What’s new in the updates for macOS Tahoe – https://support.apple.com/en-us/122868
What’s new for enterprise in macOS Tahoe – https://support.apple.com/en-us/124963
Apple Security Updates Page – https://support.apple.com/en-us/HT201222
macOS Tahoe Mac App Store link – Apple stopped creating a Mac App Store link for macOS Downloads. Sequoia was the final OS that has an App Store link.
macOS Tahoe features page – https://www.apple.com/macos/os/
Platform Security Guide – New macOS Tahoe Background Security Improvements or BSI.
Platform Guide Deployment – What’s new in Apple platform deployment

AppleSeed Notes Link = appleseed.apple.com/

Developer Public Link = developer.apple.com/documentation/macos-release-notes

macOS Deployment References Changes – https://support.apple.com/guide/deployment-reference-macos/document-revision-history-apd04dff7069/web

2. macOS Tahoe Final & Beta Release History

20. macOS Tahoe 26.5.1 (25F80) – 6/01/26
19. macOS Tahoe 26.5 (25F71) – 5/11/26
18. macOS Tahoe 26.4.1 (25E253) – 4/09/26
17. macOS Tahoe 26.4 (25E246) – 3/24/26
16. macOS Tahoe 26.3.1 (25D2128) – 3/4/26
15. macOS Tahoe 26.3 (25D125) – 2/11/26
14. macOS Tahoe 26.2 (25C56) – 12/12/25
13. macOS Tahoe 26.1 (25B78) – 11/03/25
12. macOS Tahoe 26.0.1 (25A362) – 10/29/25
11. macOS Tahoe 26.0.0 (25A354) – 10/15/25
10. macOS Tahoe 26 RC (25A353) – 10/09/25
9. macOS Tahoe 26 Beta 9 (25A5349a) – 10/02/25
8. macOS Tahoe 26 Beta 8 (25A5349a) – 9/25/25
7. macOS Tahoe 26 Beta 7 (25A5346a) – 8/18/25
6. macOS Tahoe 26 Beta 6 (25A5338b) – 8/11/25
5. macOS Tahoe 26 Beta 5 (25A5327h) – 8/07/25
4. macOS Tahoe 26 Beta 4 (25A5316i) – 7/22/25
3. macOS Tahoe 26 Beta 3 (25A5306g) – 7/07/25
2. macOS Tahoe 26 Beta 2 (25A5295e) – 6/23/25
1. macOS Tahoe 26 Beta 1 (25A5279m) – 6/09/25

3. macOS Tahoe Full Installer.app

Apple has released the full installer for macOS Tahoe. I list all the of the Full installers in the link below.

https://mrmacintosh.com/macos-tahoe-full-installer-database-download-directly-from-apple/

InstallAssistant.pkg = Full download. Installing this package will add the full “Install macOS Tahoe.app” to your applications folder.

4. Apple Silicon IPSW Restore file Update

Apple has released the full IPSW restore file of macOS for Apple Silicon Macs. I keep track of all of them in my Apple Silicon Firmware Database

Get them here –> https://mrmacintosh.com/apple-silicon-m1-full-macos-restore-ipsw-firmware-files-database/

5. macOS Tahoe Update sizes

Delta Update

The delta update will automatically change in size for exactly what your macOS version needs.

Full update & OCLP Users = NOT SUPPORTED YET

Apple Silicon Updates

Delta from macOS Tahoe 26.5 with size = 2.14GB

Upgrade from macOS Sequoia 15.7.7 with size =

Intel Updates

Delta Update from macOS Tahoe 26.5 with size = 929MB

6. Apple Silicon System Firmware Version

This update has a new firmware update. The version number is reported in System Information under “System Firmware Version“. Also known as mBoot.

Apple Silicon Firmware = NOT Updated

20. macOS Tahoe 26.5.1 = 18000.120.36
19. macOS Tahoe 26.5 = 18000.120.36
18. macOS Tahoe 26.4.1 = 18000.101.7
17. macOS Tahoe 26.4 = 18000.101.7
16. macOS Tahoe 26.3.1 = 13822.81.10
15. macOS Tahoe 26.3 = 13822.81.10
14. macOS Tahoe 26.2 = 13822.61.10
13. macOS Tahoe 26.1 = 13822.41.1
12. macOS Tahoe 26.0.1 = 13822.1.2
11. macOS Tahoe 26.0 = 13822.1.2
10. macOS Tahoe RC = 13822.1.2
9. macOS Tahoe Beta 9 = 13822.1.2
8. macOS Tahoe Beta 8 = 13822.1.2
7. macOS Tahoe Beta 7 = 13822.1.2
6. macOS Tahoe Beta 6 = 13822.1.2
5. macOS Tahoe Beta 5 = 13822.0.277.0.3
4. macOS Tahoe Beta 4 = 13822.0.233
3. macOS Tahoe Beta 3 = 13822.0.194.0.3
2. macOS Tahoe Beta 2 = 13822.0.166.0.1
1. macOS Tahoe Beta 1 = 13822.0.88.511.1

7. Apple Silicon OS loader Version (iBoot)

OS Loader Version (iBoot) also referred to as “iBoot second-stage loader”, is Apple’s stage 2 bootloader. The OS loader version will be the same as the “System Firmware Version” on the latest OS. On previous versions of macOS Monterey and Big Sur, the OS loader version will be a version behind. Example = Monterey = 7459.121.3 & Big Sur = 6723.140.2

OS Loader version = NOT Updated

20. macOS Tahoe 26.5.1 = 18000.120.36
19. macOS Tahoe 26.5 = 18000.120.36
18. macOS Tahoe 26.4.1 = 18000.101.7
17. macOS Tahoe 26.4 = 18000.101.7
16. macOS Tahoe 26.3.1 = 13822.81.10
15. macOS Tahoe 26.3 = 13822.81.10
14. macOS Tahoe 26.2 = 13822.61.10
13. macOS Tahoe 26.1 = 13822.41.1
12. macOS Tahoe 26.0.1 = 13822.1.2
11. macOS Tahoe 26.0 = 13822.1.2
10. macOS Tahoe RC = 13822.1.2
9. macOS Tahoe Beta 9 = 13822.1.2
8. macOS Tahoe Beta 8 = 13822.1.2
7. macOS Tahoe Beta 7 = 13822.1.2
6. macOS Tahoe Beta 6 = 13822.1.2
5. macOS Tahoe Beta 5 = 13822.0.277.0.3
4. macOS Tahoe Beta 4 = 13822.0.233
3. macOS Tahoe Beta 3 = 13822.0.194.0.3
2. macOS Tahoe Beta 2 = 13822.0.166.0.1
1. macOS Tahoe Beta 1 = 13822.0.88.511.1

8. Intel T2 BridgeOS Update

The Version of BridgeOS for your T2 Security Chip (2018-2020 Intel Macs) was updated.

BridgeOS version = NOT Updated

20. macOS Tahoe 26.5.1 = 23.16.15067.0.0
19. macOS Tahoe 26.5 = 23.16.15067.0.0
18. macOS Tahoe 26.4.1 = 23.16.14242.0.0
17. macOS Tahoe 26.4 = 23.16.14242.0.0
16. macOS Tahoe 26.3.1 = 23.16.13120.0.0
15. macOS Tahoe 26.3 = 23.16.13120.0.0
14. macOS Tahoe 26.2 = 23.16.12048.0.0
13. macOS Tahoe 26.1 = 23.16.11072.0.0
12. macOS Tahoe 26.0.1 = 23.16.10350.0.0
11. macOS Tahoe 26.0 = 23.16.10350.0.0
10. macOS Tahoe RC = 23.16.10350.0.0
9. macOS Tahoe Beta 9 = 23.16.10350.0.0
8. macOS Tahoe Beta 8 = 23.16.10348.5.1
7. macOS Tahoe Beta 7 = 23.16.5342.0.1
6. macOS Tahoe Beta 6 = 23.16.5342.0.1
5. macOS Tahoe Beta 5 = 23.16.5331.0.4
4. macOS Tahoe Beta 4 = 23.16.5320.0.2
3. macOS Tahoe Beta 3 = N/A
2. macOS Tahoe Beta 2 = N/A
1. macOS Tahoe Beta 1 = 23.16.5283.0.7

9. Intel T2 Firmware Update

The System Firmware Version for your Mac (2019-2020)

Firmware version = Not Updated

7. macOS Tahoe 26.5.1 = 2103.100.6.0.0 (iBridge: 23.16.15067.0.0,0)
6. macOS Tahoe 26.5 = 2103.100.6.0.0 (iBridge: 23.16.15067.0.0,0)
5. macOS Tahoe 26.4.1 = 2103.100.6.0.0 (iBridge: 23.16.14.242.0.0,0)
4. macOS Tahoe 26.4 = 2103.100.6.0.0 (iBridge: 23.16.14.242.0.0,0)
3. macOS Tahoe 26.3.1 = 2094.80.5.0.0 (iBridge: 23.16.13120.0.0,0)
2. macOS Tahoe 26.3 = 2094.80.5.0.0 (iBridge: 23.16.13120.0.0,0)
1. macOS Tahoe 26.2 = 2094.40.1.0.0 (iBridge: 23.16.12048.0.0,0)

10. Safari Update

The new version of Safari was 26 is included in the macOS 26 update.

Safari = NOT Updated

20. macOS Tahoe 26.5.1 = Safari 26.5 (21624.2.5.11.4)
19. macOS Tahoe 26.5 = Safari 26.5 (21624.2.5.11.4)
18. macOS Tahoe 26.4.1 = Safari 26.4 (21624.1.16.11.4)
17. macOS Tahoe 26.4 = Safari 26.4 (21624.1.16.11.4)
16. macOS Tahoe 26.3.1 = Safari 26.3.1 (21623.2.7.11.7)
15. macOS Tahoe 26.3 = Safari 26.3 (21623.2.7.11.6)
14. macOS Tahoe 26.2 = Safari 26.2 (21623.1.14.11.9)
13. macOS Tahoe 26.1 = Safari 26.1 (info missing)
12. macOS Tahoe 26.0.1 = Safari 26.0.1 (21622.1.22.11.15)
11. macOS Tahoe 26.0 = Safari 26.0 (21622.1.22.11.14)
10. macOS Tahoe RC = Safari 26.0 (21622.1.22.11.14)
9. macOS Tahoe Beta 9 = Safari 26.0 (21622.1.22.11.13)
8. macOS Tahoe Beta 8 = Safari 26.0 (21622.1.22.11.12)
7. macOS Tahoe Beta 7 = Safari 26.0 (21622.1.22.11.11)
6. macOS Tahoe Beta 6 = Safari 26.0 (21622.1.22.11.5)
5. macOS Tahoe Beta 5 = Safari 26.0 (21622.1.21.11.3)
4. macOS Tahoe Beta 4 = Safari 26.0 (21622.1.19.11.2)
3. macOS Tahoe Beta 3 = Safari 26.0 (21622.1.18.1.5)
2. macOS Tahoe Beta 2 = Safari 26.0 (21622.1.16.11.2)
1. macOS Tahoe Beta 1 = Safari 26.0 (21622.1.14.11.4)

11. What’s new for Enterprise in Tahoe

Enterprise changes in macOS Tahoe 26.5

https://support.apple.com/en-us/124963

12. Security Content of macOS Tahoe

Security vulnerabilities in this Update

Fixes addressed in this update = 0

Safari 26.6.1 (WebKit) = 0

https://support.apple.com/en-us/126794

https://support.apple.com/en-us/100100

13. macOS Tahoe Release Notes

macOS Tahoe 26.5.1 Update Patch Notes

This update addresses an issue for enterprise users where Macs with an M5 chip could unexpectedly shut down when using certain content filtering network extensions.
developer.apple/com/forum/thread/822390

14 macOS Tahoe Developer Release Notes

This update also includes the following Developer enhancements and bug fixes:

The macOS 26.5 SDK provides support to develop apps for Mac computers running Tahoe 26.5. The SDK comes bundled with Xcode 26.5, available from the Mac App Store. For information on the compatibility requirements for Xcode 26.5, see Xcode 26.5 Release Notes.

New Features

You can read pricing information for subscriptions that have a monthly with 12-month commitment billing plan configuration in App Store Connect or StoreKit Testing in Xcode through the new PricingTerms model on SubscriptionInfo.pricingTerms. (150388310)
You can specify the billing plan type to use for subscriptions that have a monthly with 12-month commitment billing plan configuration using the new billingPlanType PurchaseOption. (150388542)
Read customer entitlement metadata for subscriptions purchased with a monthly billing plan type through the new CommitmentInfo data model on Transaction and SubscriptionRenewalInfo. (150388746)
When you import both StoreKit and SwiftUI, you can merchandise the monthly billing plan configuration for subscriptions that have a monthly with 12-month commitment billing plan using built-in styles through the new preferredSubscriptionPricingTerms(_:) API. (150389069)

Resolved Issues

Fixed: The App Version field in the ASN.1 app receipt might contain the string “null” instead of the expected version number. (171614522) (FB22114908)
Fixed: Transaction.currentEntitlements might be empty if a customer has an active subscription when the device’s system calendar is set to a non-Gregorian format. (173415174)

https://developer.apple.com/documentation/macos-release-notes

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