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  3. #Mythos finds a #curl vulnerability

#Mythos finds a #curl vulnerability

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  • 4censord@unfug.social4 4censord@unfug.social

    @gnirre @bagder with the most glancing of looks, looking at the 150 version of firefox (and some rounding),
    curl: 200k lines of c
    firefox:

    • 5M lines of rust
    • 9M lines of C and C++
    • 200k lines of assembly
    • 2M lines of python

    so like, without looking at anything else, firefox is significantly bigger

    natanox@chaos.socialN This user is from outside of this forum
    natanox@chaos.socialN This user is from outside of this forum
    natanox@chaos.social
    wrote last edited by
    #47

    @4censord @gnirre @bagder Also, didn't they intentionally disable all mitigations, sandboxing etc. in Firefox *and* include every teeny tiny bug it found (without mentioning the false-positives, which were probably a metric shit ton) to bolster those numbers?

    There were lots of shenanigans afaik.

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    • km@mastodon.babb.noK km@mastodon.babb.no

      @paco @bagder yeah, let me clarify: i talked with people who not themselves used mythos, but whose org was given access, so yeah, they just told something which they were told

      paco@infosec.exchangeP This user is from outside of this forum
      paco@infosec.exchangeP This user is from outside of this forum
      paco@infosec.exchange
      wrote last edited by
      #48

      @km Yeah. I didn’t mean it personally. I wasn’t criticising what you said, I’m sorry if I sounded that way.

      I was just pointing out this constant theme. The only thing that ever is made public is the fully-polished, human-vetted final result. They carefully hide all other details and the press don’t care.

      @bagder

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      • 0x0@hachyderm.io0 0x0@hachyderm.io

        @quinn

        Especially if it's subscription-based, as these models seem to be good at finding only specific sets of problems and then dry out, but even 10k per use is really gov or big corpo territory.

        @kleisli @bagder

        quinn@social.circl.luQ This user is from outside of this forum
        quinn@social.circl.luQ This user is from outside of this forum
        quinn@social.circl.lu
        wrote last edited by
        #49

        @0x0 @kleisli @bagder to be clear i picked that number out of my butt, but it is clear to me that it's going to be very hard to make up their investment in it, much less than the min 10x (which would probably be a couple trillion dollars)

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        • rugk@chaos.socialR This user is from outside of this forum
          rugk@chaos.socialR This user is from outside of this forum
          rugk@chaos.social
          wrote last edited by
          #50

          @das_robin @oots @bagder maybe @firefoxnightly can comment on that

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          • bagder@mastodon.socialB bagder@mastodon.social

            My personal conclusion can however not end up with anything else than that the big hype around this model so far was primarily marketing. I see no evidence that this setup finds issues to any particular higher or more advanced degree than the other tools have done before Mythos. Maybe this model is a little bit better, but even if it is, it is not better to a degree that seems to make a significant dent in code analyzing.

            peteriskrisjanis@toot.lvP This user is from outside of this forum
            peteriskrisjanis@toot.lvP This user is from outside of this forum
            peteriskrisjanis@toot.lv
            wrote last edited by
            #51

            @bagder 💯☝️this

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            • bagder@mastodon.socialB bagder@mastodon.social

              My personal conclusion can however not end up with anything else than that the big hype around this model so far was primarily marketing. I see no evidence that this setup finds issues to any particular higher or more advanced degree than the other tools have done before Mythos. Maybe this model is a little bit better, but even if it is, it is not better to a degree that seems to make a significant dent in code analyzing.

              rootwyrm@weird.autosR This user is from outside of this forum
              rootwyrm@weird.autosR This user is from outside of this forum
              rootwyrm@weird.autos
              wrote last edited by
              #52

              @bagder it's all marketing. And any improvements are completely moot, as the actual *costs* to find that single bug were in the tens of thousands of dollars minimum. That's the MINIMUM known cost.
              It would not surprise me if finding that one bug cost $75k, $100k, $200k of compute time. It's a pile of shit, hilariously inefficient slop that sometimes behaves as a fuzzer that occasionally finds a crumb.

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              • alterelefant@mastodontech.deA alterelefant@mastodontech.de

                @bagder
                At least it works. It would have been quite a disaster if it found zero.

                totoroot@ibe.socialT This user is from outside of this forum
                totoroot@ibe.socialT This user is from outside of this forum
                totoroot@ibe.social
                wrote last edited by
                #53

                @alterelefant@mastodontech.de @bagder@mastodon.social Are you a machine?
                Classifying finding a single vulnerability (1) as success and 0 as failure sure seems like it
                😁
                The world is not black and white and the usefulness of LLMs for finding vulnerabilities IMO isn't either

                alterelefant@mastodontech.deA 1 Reply Last reply
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                • totoroot@ibe.socialT totoroot@ibe.social

                  @alterelefant@mastodontech.de @bagder@mastodon.social Are you a machine?
                  Classifying finding a single vulnerability (1) as success and 0 as failure sure seems like it
                  😁
                  The world is not black and white and the usefulness of LLMs for finding vulnerabilities IMO isn't either

                  alterelefant@mastodontech.deA This user is from outside of this forum
                  alterelefant@mastodontech.deA This user is from outside of this forum
                  alterelefant@mastodontech.de
                  wrote last edited by
                  #54

                  @totoroot
                  I admit it is very binary.
                  @bagder

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                  • redsakana@infosec.exchangeR redsakana@infosec.exchange

                    @bagder This suggests a fun exercise for someone interested in messing around with LLMs:

                    1. Put back all the curl security issues previously found by LLM tools by dropping the fix commits from history or otherwise obfuscating the revert.

                    2. Feed the re-vulnerabilized repo to a selection of models and see what are the cheapest ones (by memory, time and/or monetary cost) that can find, say, 50%/75%/100% of the issues found by the warehouse-scale "foundation models".

                    Feels like a large part of the current results should be doable with significantly smaller resources, because being trained on every tweet and reddit post and libgen book ever is not obviously related to the task.

                    utf_7@mastodon.socialU This user is from outside of this forum
                    utf_7@mastodon.socialU This user is from outside of this forum
                    utf_7@mastodon.social
                    wrote last edited by
                    #55

                    @redsakana @bagder

                    llm tools found security issues in curl? doubt

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                    • peteriskrisjanis@toot.lvP This user is from outside of this forum
                      peteriskrisjanis@toot.lvP This user is from outside of this forum
                      peteriskrisjanis@toot.lv
                      wrote last edited by
                      #56

                      @normis Normi, tu taču zini ka tas ir curl autors?

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                      • uint8_t@chaos.socialU This user is from outside of this forum
                        uint8_t@chaos.socialU This user is from outside of this forum
                        uint8_t@chaos.social
                        wrote last edited by
                        #57

                        @das_robin @oots @bagder there was this blog post dismissing lots of the myth https://www.flyingpenguin.com/the-boy-that-cried-mythos-verification-is-collapsing-trust-in-anthropic/

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                        • bagder@mastodon.socialB bagder@mastodon.social

                          #Mythos finds a #curl vulnerability

                          yes, as in singular one.

                          Link Preview Image
                          Mythos finds a curl vulnerability

                          yes, as in singular one. Back in April 2026 Anthropic caused a lot of media noise when they concluded that their new AI model Mythos is dangerously good at finding security flaws in source code. Apparently Mythos was so good at this that Anthropic would not release this model to the public yet but instead … Continue reading Mythos finds a curl vulnerability →

                          favicon

                          daniel.haxx.se (daniel.haxx.se)

                          elgringomexicano@mastodon.socialE This user is from outside of this forum
                          elgringomexicano@mastodon.socialE This user is from outside of this forum
                          elgringomexicano@mastodon.social
                          wrote last edited by
                          #58

                          @bagder I picked 10 in the poll to play it safe, but 1 was my second choice and I'm not surprised at all. Long live #curl .

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                          • bagder@mastodon.socialB bagder@mastodon.social

                            #Mythos finds a #curl vulnerability

                            yes, as in singular one.

                            Link Preview Image
                            Mythos finds a curl vulnerability

                            yes, as in singular one. Back in April 2026 Anthropic caused a lot of media noise when they concluded that their new AI model Mythos is dangerously good at finding security flaws in source code. Apparently Mythos was so good at this that Anthropic would not release this model to the public yet but instead … Continue reading Mythos finds a curl vulnerability →

                            favicon

                            daniel.haxx.se (daniel.haxx.se)

                            mikemcquaid@mastodon.socialM This user is from outside of this forum
                            mikemcquaid@mastodon.socialM This user is from outside of this forum
                            mikemcquaid@mastodon.social
                            wrote last edited by
                            #59

                            @bagder This closely matches the experience Homebrew has also had with Mythos. Also one vulnerability found and in our case it was a pretty irrelevant one.

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                            • oots@infosec.exchangeO This user is from outside of this forum
                              oots@infosec.exchangeO This user is from outside of this forum
                              oots@infosec.exchange
                              wrote last edited by
                              #60

                              @das_robin @bagder
                              Yes, #Firefox is probably a few orders of magnitude more complex than #curl and definitely much bigger.

                              Still, the blog post explicitly mentions "In addition to fixing the 271 bugs identified by Claude Mythos Preview in the 150 release, we’ve shipped more of these fixes in 149.0.2, 150.0.1, and 150.0.2.", so >270 attributed to #Mythos *alone*.

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