About the security content of macOS Tahoe 26.6 (support.apple.com)
187 points by andor 11 hours ago
tengwar2 9 hours ago
15.7.8 is out today as well, with these security fixes: https://support.apple.com/en-us/128071.
For context, there have been issues with MacOS 26 which have led many people to defer upgrading until MacOS 27 is available, and MacOS 15 is the previous version.
jghn 8 hours ago
> For context, there have been issues with MacOS 26 which have led many people to defer upgrading
For me the issue is liquid glass. Which I doubt is getting fixed any time soon
illithid0 8 hours ago
Also a liquid glass hater, but for what it's worth, 27 is supposed to make it a little bit better. I would prefer to go back to what I had before I had to upgrade into this horrible UI, but this is better than nothing.
https://www.cultofmac.com/news/liquid-glass-changes-ios-27-m...
hbn 7 hours ago
noname120 7 hours ago
trollbridge 8 hours ago
lapcat 8 hours ago
coldpie 4 hours ago
I found if you turn off transparency effects and turn on high contrast in the accessibility settings, it's actually a pretty nice looking UI. Still has some dumb quirks like inconsistent corner radiuses and text appearing under UI elements (because they're assumed to be transparent, but aren't). But all software is trash in 2026 so be thankful it isn't even worse, I guess.
Melatonic 2 hours ago
shepherdjerred 4 hours ago
27 is a lot better. You can make the UI opaque again (they provide a transparency slider)
pmdr 6 hours ago
I bought a MBP mainly for the hardware, otherwise I'd have stuck with Linux. OS-wise, the jump from Monterey (which I'd last used) to Sequoia was smooth and still feels that way. I prefer not to notice the OS at all, something that I feel would be hard to do on Tahoe due to all that liquid glass and dumb transparency and animations.
Seriously, who the heck even asked for those?
frizlab 8 hours ago
macOS 27 does polish Liquid Glass and makes it look passable on macOS IMHO. It was very bad on 26. Comically bad.
reddalo 7 hours ago
IdiotSavage 7 hours ago
I hate the round corners. It's already too much on 15, but way worse on 26. It looks like "Baby's first OS", designed by Fisher-Price.
hbn 7 hours ago
Hamuko 8 hours ago
Same. It's not the worst thing in the world, at least with Reduce Transparency enabled in the Accessibility settings, but I still don't feel any inclination to upgrade. My personal Mac Studio is macOS 15 and my work MacBook is on macOS 26, and I don't think there's a single thing that I find to be better on the work laptop than on my personal machine.
I might update to macOS 26 in September to be ready to update to macOS 27. Being two versions behind doesn't seem reasonable and I'd rather be on the "Tahoe but less shitty" version than Tahoe itself.
simlevesque 7 hours ago
You can disable it in the accessibility preferences.
embedding-shape 8 hours ago
Same thing happens almost every release. I've stopped updating my Mac machine until I see something in the release notes I literally have to have in order to continue doing macOS/iOS builds, otherwise I'm staying on the version I've validated to work, and I know the existing bugs with.
GeekyBear 2 hours ago
As we used to say in the Windows world, wait for service pack 3.
DavideNL 7 hours ago
A better strategy would probably be to stick with the previous *major* release, but, do install its ("minor") security updates...
embedding-shape 6 hours ago
reddalo 7 hours ago
>have led many people to defer upgrading until MacOS 27 is available
Then there's me, crying in MacBook Pro 2019 stuck on MacOS 15 because 27 won't be available for my machine.
bouke 7 hours ago
The question now is, is 27 sufficient enough of an improvement over 15 to upgrade and tolerate Liquid Glass?
ExoticPearTree 8 hours ago
26.0 had a very annoying video jitter issue, but that was the first things that I noticed to be fixed in the next 26 release. Other than that, it worked just fine.
andreasley 8 hours ago
The bug that led to network connection issues after 49 days of uninterrupted uptime was a bit of a showstopper for me.
carra 8 hours ago
Are there no versions between MacOS 15 and 26???
kylemaxwell 8 hours ago
They changed the numbering scheme, so... no, there aren't. Version numbers are now year-based, but previously they were not.
hbn 7 hours ago
Last year they unified all their OS version numbers to just match upcoming year.
macOS went from 15 to 26
iOS went from 18 to 26
watchOS went from 11 to 26
and so on
classified 6 hours ago
No, 26 is the successor of 15. They changed the numbering to year-based.
crossroadsguy 8 hours ago
Did they un-hardcode the corner radius? I mean were they able to? I mean not that that anyone at this point needs convincing how utterly disgusting incompetent they’re at software.
gedy 7 hours ago
They reduced the radius back to older, smaller size and now all apps use a single radius, vs the weird 3 different radii in Tahoe. Looks better.
hbn 7 hours ago
pjmlp 10 hours ago
Map the amount of fixes with "... improved bounds checking...", "...improved memory handling...", "...improved memory management..." into the amount of developer, QA and release management teams salaries per hour, versus other stuff they could be working on, and that gives an approximate value of how using specific languages maps into monetary loss, and why companies are starting to care nowadays, given computers are always exposed to the world network.
snvzz 9 hours ago
If anything, there's a strong argument to switch to seL4.
yjftsjthsd-h 5 hours ago
It was my vague understanding that by the time you implemented all the apis needed to run normal software on top of that, you either have enough apis that different tasks can still compromise each other, or you have shoved everything into a single task with very little isolation between normal user processes. In either case, it doesn't seem like you actually gained so much. What am I missing?
pjmlp 5 hours ago
Indeed, however without some regulatory help it Will take its time for such kind of improvements across the industry.
bluecalm 10 hours ago
>>, and that gives an approximate value of how using specific languages maps into monetary loss, and why companies are starting to care nowadays, given computers are always exposed to the world network.
You need also factor development time and ease of finding developers willing to work in a specific language. There are other factors like readability of the code (very verbose languages are likely to be worse) and cost of maintenance - languages forcing a lot of abstractions are likely much worse.
acdha 8 hours ago
> You need also factor development time and ease of finding developers willing to work in a specific language
This even more strongly favors Rust or Swift. Nobody is writing C or even Objective-C in 2026 as a growth language.
zbentley 7 hours ago
zbentley 7 hours ago
> very verbose languages are likely to be worse
Citation needed. I don't think there's a correlation there. Over-architected Java spaghetti is verbose and unmaintainable. Under-architected Perl code golf that metastisized is terse and unmaintainable.
> languages forcing a lot of abstractions are likely much worse
Citation needed. C++ has had some very high-level abstractions on top of a low-level runtime for awhile, and plenty of people have decided to use it and hire for it regardless. What counts as an "abstraction" or "forced abstraction" is a very very subjective topic.
pjmlp 6 hours ago
UqWBcuFx6NV4r 9 hours ago
“nah bro, all those other developers are just garbage, I am the one person that can write memory safe C”
embedding-shape 11 hours ago
Lots of "in collaboration with Claude and Anthropic Research" mentions, no mentions of other labs. I'd assume Apple already had access to whatever the most powerful model is at the various US-based labs, but perhaps not?
woadwarrior01 9 hours ago
Those were voluntary disclosures by two Anthropic researchers and the security firm Calif. I know one more CVE on the list that was discovered using an AI agent and wasn't disclosed as such. I suspect there are many more.
tombot 11 hours ago
Apple isn’t friends with OpenAI anymore
muterad_murilax 10 hours ago
What happened?
fnord123 10 hours ago
mrtksn 10 hours ago
lapcat 8 hours ago
> Lots of "in collaboration with Claude and Anthropic Research" mentions
I wouldn't say 4 is lots. The entire list is massive. I haven't counted myself, but someone claimed that macOS 26.6 has the all-time record with 155 CVEs.
embedding-shape 6 hours ago
Considering that in Feb 2026 (https://support.apple.com/en-us/126348) Claude wasn't mentioned even once, 4 sure sounds like "lots" compared to nothing :) But you're right, it's subjective ultimately.
senadir 10 hours ago
Apple also hosts a copy of Claude internally in their servers.
cromka 10 hours ago
Do they? As in Claude but on premises? Wonder if this is gonna be the solution that e.g. banks will require, exactly like they do now for cloud services (e.g. Azure on premises).
Cider9986 9 hours ago
pbronez 10 hours ago
bel8 8 hours ago
source?
edit: it seems asking for a source it frowned uppon in this site. And it seems there's no source.
mholm 7 hours ago
MBCook 7 hours ago
claiir 6 hours ago
also “ Using GLM From Z.AI”
TheJoeMan 7 hours ago
This may be a naive take, so if anyone has insight please feel free to share, but across Windows, Mac, and Linux OS's I see many cases of path parsing vulnerabilities resulting in sandbox escapes, code execution, or data access issues. When presenting the user with a file picker or command-line input, is it really needed that the software can handle the full POSIX spec?
I do not see a "typical" user needing to access a path with say a network storage but multiple ../.. and hard and soft symlinks simultaneously. I think "be liberal in what you accept" might need to be revisited for path parsing with some sort of OS-wide single-implementation as an optional feature.
acuozzo 6 hours ago
> I do not see a "typical" user needing to access a path with say...
Typical users run software written by atypical users.
> some sort of OS-wide single-implementation
How do you propose handling migration? What if someone tries to expand an old archive file containing a now-forbidden path?
TheJoeMan 5 hours ago
What I mean is that for “honest” software, built-in to the OS or otherwise, the programmer finds a situation where they take some user-supplied input and concatenate that into a path, and call something like OS.read(). If they want to prevent the user from causing havoc, they now find themselves dealing with path validation in their software instead of calling OS.safeOpen(), which would be a reduced subset of allowed chars?
SoftTalker 5 hours ago
catlifeonmars 6 hours ago
How would you enforce a single implementation of path parsing?
AJRF 11 hours ago
Weird thing to see at number 3 on HN - is there some subtle context I am missing here?
Are we wink winking that it's a lot of fixes?
microtonal 9 hours ago
It is a lot of fixes and the Android Security Bulletins of June and Android 17 also had a lot of fixes [1], despite ASBs only containing high/critical vulnerabilities (other vulnerabilities are only fixed in major releases and QPRs, which most Android vendors respectively roll out late or never at all).
I think the story here is that vulnerability discovery has accelerated a lot with LLMs, but since are adversaries are doing the same, it is more important than ever to update quickly (and not let some Android vendors get away with their lazy update schedules).
[1] https://source.android.com/docs/security/bulletin/2026/2026-... https://source.android.com/docs/security/bulletin/android-17
cubefox 8 hours ago
So using newish phones that don't get updated anymore could be a lot more dangerous now than it was just a year ago.
acdha 8 hours ago
grahamlee 10 hours ago
And it's not actually that much information "about the security content". For example: "Impact: An app may be able to access sensitive user data. Description: An access issue was addressed with additional sandbox restrictions." This references CVE-2026-43819, which doesn't have any more information. Compare this with the nearly decade-old https://support.apple.com/en-gb/103680, and you see much more specific information about problems and their remedies (except in situations where Apple's action was to update a vendor component).
Gigachad 7 hours ago
The vagueness could be intentional. There’s been a big issue with linux where proof of concept exploit code gets posted before the bug is announced because people reverse engineer it from the fix commits.
Apple has the advantage that they can keep everything secret for long enough for the patches to roll out. And realistically there is no reason the user needs to know the details of an exploit that was patched before it was ever used.
DStiego 11 hours ago
Relevant context might be for example that there are 4 mentions each of Claude by Anthropic and XGPT by ThreatBook, both based on LLMs.
AI attribution might be one reason people are particularly curious.
AJRF 9 hours ago
I missed that, thanks for pointing out
cromka 10 hours ago
I think it's because it's the first big batch of fixes found at Apple by Mythos.
nozzlegear 7 hours ago
Is this speculation? Where does it say Mythos was responsible for any of this?
cromka 5 hours ago
Tepix 10 hours ago
Yes, it's really quite a lot https://9to5mac.com/2026/07/27/ios-26-6-fixes-over-75-securi...
croemer 11 hours ago
I think that's it?
nizbit 11 hours ago
Collision counts are absurd. CVE-2026-43739 has roughly twenty credited researchers; CVE-2026-43816 has nearly as many. And ai attribution getting credit.
croemer 11 hours ago
One CVE even lists the same person twice!
CVE-2026-64691: Ruslan Dautov, Ruslan Dautov
Someone 9 hours ago
> One CVE even lists the same person twice!
Not necessarily. Could be two persons sharing that name. See https://revstat.ine.pt/index.php/REVSTAT/article/view/382
ayewo an hour ago
proactivesvcs 10 hours ago
One of them lists an anonymous person!
CVE-2026-43744: Mathis Mansière, an anonymous researcher
nkrisc 10 hours ago
conradfr 10 hours ago
FabHK 5 hours ago
Apropos, anyone else saw "fast user switching" in Tahoe turn into "excruciatingly slow user switching which after a minute of switching without success rebooted the whole damn machine"?
BoardsOfCanada 4 hours ago
It would be so nice to see how many zero-days are going away for bad players right now.