Anthropic built a model so dangerous they refused to release it publicly. Then a Discord group got in anyway.
The Model They Wouldn't Shi...
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Not surprising. When access depends on vendor chains and predictable patterns, the perimeter’s already soft. This is an access governance issue, not a model issue.
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If the Mythos AI was as good as Anthropic claimed at finding securitry issues, why didn't they use it to test and fix its own instance as well?
It's a fair question but tbh these are categorically different problems. Mythos finds code-level zero-days — buffer overflows, use-after-free bugs, logic flaws in protocol implementations. The access failure here wasn't a software vulnerability at all. Someone guessed a URL based on Anthropic's naming convention. That's an OPSEC failure, same class as naming your S3 bucket company-prod-backup and leaving it public. No vulnerability scanner — no matter how sophisticated — catches "we named the endpoint something predictable." It's a human process failure, not a code failure. The irony is real though. You'd think an org building a model that autonomously roots FreeBSD boxes would have someone on staff who says "hey maybe don't use the model codename in the production URL."
If no scanner catches that then those people are screwed on a much more basic level. They can get hacked with or without artificial intelligence because they lack natural intelligence or so it seems.
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I guess Marketing Strategy, after being in this industry for last 4 years, i can say they are always 2 steps ahead !!!
The detail that sticks with me isn't the breach itself—it's the method. An educated guess about URL patterns. Not a zero-day. Not a sophisticated attack chain. Just someone noticing that Anthropic names things consistently and trying the obvious permutation.
That's the kind of failure that feels almost inevitable once you hear it. Security through obscurity works until someone bothers to look. And the people who bother to look are exactly the ones you don't want finding the thing. A Discord group of enthusiasts got there first. Next time it might be someone with a different agenda and better opsec.
What this exposes is a structural tension in how frontier models are being deployed. The partnership model—40 trusted organizations, carefully vetted—assumes that each of those 40 organizations has perimeter security as good as Anthropic's. They don't. They can't. One vendor with a contractor who leaves an API key in a public repo, and the whole containment model unravels. The attack surface scales with the partner list.
The CISA detail is the part that feels like a policy failure hiding inside a technical story. The agency responsible for defending critical infrastructure against exactly the kind of vulnerabilities Mythos can find... doesn't have access. But a third-party contractor's employee apparently did. That's not a security decision. That's an allocation decision dressed up as one.
What I keep wondering is whether controlled release at this capability level is even a coherent concept. If the model can find zero-days autonomously, the value of access is asymmetric. Defenders might patch a few things. An attacker with access gets a permanent research advantage. The containment has to be perfect. And perfect containment across 40 organizations with different security cultures, different contractor policies, and different levels of discipline about credential hygiene... that's a lot to ask. At what point does the controlled release model stop being a safety measure and start being a liability distribution system?
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Back in the 90s, we called this "guessing the FTP directory was named /secret." Today, it's a "third-party vendor perimeter breach." It is so deeply, beautifully human that we can build an AI capable of exploiting a 17 yr. old FreeBSD vulnerability autonomously, but we still can't patch the human urge to name a production endpoint /api/v1/mythos-preview-super-secret.
And the .npmignore leak from last month? Chef's kiss. I've taken down prod with a bad regex before, so I have zero stones to throw, but man... you build a titanium bank vault and leave the key under a plastic rock.
The NSA and DoD fighting over the toy while CISA is locked outside in the rain is just the cherry on top. Never change, tech industry. Keep your URLs weird and your .npmignore files updated, kids! Great read, btw!
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This is concerning if true. Do you have a source or link to the original report?
Not doubting you just that dangerous model accessed by unauthorized people is a serious claim. Would love to read more about how it happened and what Anthropic has said about it.
If this is real, it raises some uncomfortable questions about model security, access controls, and how dangerous these models actually are when they're out in the wild.
Thanks for sharing following this closely.
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All links are attached as hyperlinks in the article only, please click them to get redirected
Security By Obscurity is Not.
All those companies, all those people at all those companies, and we thought there would be no leaks?
🙃🙂
A reminder that AI safety and access control matter just as much as model capabilitypowerful systems need strong safeguards.
Surely Ma'am!!
Great Article Om!
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The whole 'trust the vendor chain' approach falls apart the second you have 40 partners with 40 different security postures. This is just scope creep for access governance, not an AI safety story.
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Very interesting point.
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