Crash any App on Your Mac by Entering ‘File:///’

A new bug on OS X lets you crash any Mac app with a text field as long as you enter a certain phrase. The bug was filed with Apple on Thursday and can be reproduced very easily in most apps like TweetDeck, Chrome, Safari, TextEdit that have a field to enter text.

If you’re wondering why hasn’t the phrase been mentioned yet over here, it’s because entering it would crash Safari and Chrome, so we’re including an image that shows the phrase.

The bug appears to stem from the spelling correction on OS X, but it also works in places like the Safari URL bar where auto correct isn’t enabled. It works only on Mountain Lion though, Snow Leopard and Lion remain unaffected.

textedit crash mac

app crash

While this bug would certainly not be encountered by most users of OS X, it’s almost unbelievable that by simply typing in a certain set of characters, you can crash almost any Mac app. We expect Apple to resolve this bug in the final release of OS X 10.8.3.

Update: This can be potentially threatening if one of your notorious friends, or anyone for that matter with your iMessage id decides to send you a message with this phrase. It will crash the OS X Messages app and you’ll be unable to relaunch it, unless you go and delete the local messages database. (via @stroughtonsmith)

Via: 9to5Mac

Like this post? Share it!

Categories: Mac, Mountain Lion, OS X

  • Jared

    COOL. Glad I don’t use a Mac!!

    • Shrivatsa Somany

      Because anything else you use has no bugs at all right. yeah.

    • Liam Googolplex Merlyn

      Because that phrase is something you use on a regular basis…

    • Jeremy Taco Patterson


      I totally agree. I’d rather stick with these awesome Windows machines where it take REALLY complicated processes to crash them. You know, like turning them on, and/or trying to open a browser window.

      • bcsc

        If you think that something so simple would crash any computer than you are gullible. Do you think that Microsoft would become the most adopted computer platform if it really wasn’t at least as stable as Mac? I assume you also believe that the GUI was all Apple’s idea and Microsoft stole it from them?

        • A. Nony Mous

          Don’t distort history. Apple licensed the GUI from Xerox in exchange for pre-IPO Apple stock. MS then stole it from Apple. Everyone knows that.

        • Shrivatsa Somany

          AS stable as a Mac? I’m EXTREMELY sorry to point out that Windows isn’t even remotely as stable as Unix. Don’t even start trying to argue that point.

  • Didn’t work


    • Shrivatsa Somany


    • Didn’t work

      Lol first too LAWL

  • Igor

    “It just works.”

    • Igor

      “I just troll”

      • Igor

        Apparently quoting Apple’s slogan is now considered trolling. Interesting concept…

  • alkanderi

    i will try

  • Alex


    In the Old Days on Apple II Basic we’d enter ‘ 99e99 ‘ and it would Crash anything. Very helpful for Hacking into old BBSs.

    Who can tell us all why 99e99 crashed AppleSoft? (hint, what is e) Bonus Question! What’s a BBS?

    • Vik

      e = exponent ( 99 ^ 99 )

      • Alex

        And 99 to the 99th would Crash AppleSoft DOS; an early OS bug fixed in Pro Dos

  • jojo

    i bet you just tried it on safari!

  • Target

    Tried it everywhere in my mac. Didn’t crash any application.

    • A. Nony Mous

      It has to be on Mountain Lion and the capitalization is important (File not file).

  • JetForMe

    You should expand on where to find the local messages database.

  • RandomGamer342

    @iphonehacks …you do realise you included the phrase in the title, right?