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macOS 26.4 Introduces New Security Feature for Terminal Commands

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macOS Tahoe 26.4 introduces a new security feature that warns Mac users if they paste certain commands in the Terminal app that may be harmful.

macOS 26 and Terminal Feature
For those unaware, the Terminal app allows you to enter text commands to perform tasks on your Mac. Terminal is primarily intended for advanced users and developers, but unfortunately casual users can be tricked into entering harmful commands that can permanently delete files, change user permissions, and cause other problems.

Here is what the warning says when it appears:

Possible malware, Paste blocked

Your Mac has not been harmed.

Scammers often encourage pasting text into Terminal to try and harm your Mac or compromise your privacy.

These instructions are commonly offered via websites, chat agents, apps, files, or a phone call.

There is a "Paste Anyway" option if you wish to proceed.

The warning was spotted by users across Reddit and X over the past week.

macOS Tahoe 26 4 Terminal WarningScreenshot via "Mr. Macintosh"

We have yet to determine exactly which commands trigger the warning, which does not always appear. For this reason, always be careful. If you are unfamiliar with how Terminal works, it is probably best to avoid using it entirely.

macOS 26.4 was released earlier this week.

Related Roundup: macOS Tahoe
Tags: Apple Security, Terminal
Related Forum: macOS Tahoe

Top Rated Comments

klasma Avatar
klasma
1 week ago
It would be helpful if the dialog actually showed what is being pasted, so that the user could decide whether they want to “Paste Anyway”…



Since the clipboard can contain multiple contents with different mime types, and what exactly gets pasted depends on the receiving application, an accurate preview can be essential.

Attachment Image
Score: 17 Votes (Like | Disagree)
!!! Avatar
!!!
1 week ago

We have yet to determine exactly which commands trigger the warning
Presumably anything containing [ICODE]curl[/ICODE] and/or a URL.

I'm sure some will complain but I think this is a great feature
It's annoying when you know what you're doing and these "security" features get in your way. I understand the vast majority of users don't understand terminal, but that doesn't mean you need to harm my experience.

Maybe one awesome optimization would be right click → Paste should just do it
Not really a good idea, I've found it's far more likely that the basic computer user uses right-click for copying and pasting. App launches are different as most people double-click.
Score: 13 Votes (Like | Disagree)
Starfia Avatar
Starfia
1 week ago
Reactions:

• Seemingly well-intended to protect users.

• What happens when you know you know what you're doing? Is this going to bother you once in a while anyway?

• What kind of a Mac alert title is "Possible malware, Paste blocked"? A comma splice with incorrect capitalization?
Score: 12 Votes (Like | Disagree)
twistedpixel8 Avatar
twistedpixel8
1 week ago

I'm sure some will complain but I think this is a great feature
Who would complain?! Probably the same people who complain about being forced to wear a seatbelt.

“Wall lickers”, we call them in Scotland.
Score: 10 Votes (Like | Disagree)
th0masp Avatar
th0masp
1 week ago
How about making these extra safety steps optional but default - and let the user toggle them in system preferences?

Would be nice to have some choice back instead of having to deal with pop-ups and sometimes totally misleading error messages in this current state of OS affairs (like the one that calls certain downloaded installer files broken when they are merely unsigned and not coming from the Appstore).

Not everybody grew up glued to an iPad FFS. 🤪
Score: 9 Votes (Like | Disagree)
jz0309 Avatar
jz0309
1 week ago
I'm sure some will complain but I think this is a great feature
Score: 8 Votes (Like | Disagree)
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