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    Kevin Mandia's new security firm Armadin uses AI agents to hunt for zero-days

    a16z says Armadin's agents have found 90-plus zero-days at Fortune 500 companies since January 2026.

    a16zA1
    Sarah WangSW
    David GeorgeDG
    3 Sources, ,

    TLDR

    a16z says Armadin's AI agents map networks from the outside and re-attack when something changes. It says the agents have found 90-plus zero-days at Fortune 500 companies since January 2026, while autonomous patching remains a goal. In a separate post, a16z's David George quotes Mandia warning that the next year in cybersecurity won't be “pretty.”

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    3 Sources

    David George@DavidGeorge83Kevin Mandia says "There's no way to make the next year pretty." He thinks the first time a model revealed itself capable of finding thousands of vulnerabilities, is when everyone finally accepted the game has changed and AI on offense is coming. One of our most sophisticated portcos recently told us they put a significant fraction of their engineers' projects on hold and enlisted them to stress-test their own walls. Kevin's new company @ArmadinSecurity is scaling up to offer this offense-as-defense to everyone, and ultimately build out the autonomous security he believes every company will need in the AI-enabled future.3h
    Sarah Wang@sarahdingwangRT @DavidGeorge83: Kevin Mandia says "There's no way to make the next year pretty." He thinks the first time a model revealed itself capab…3h
    a16z@a16zKevin Mandia on finding 90+ security holes at Fortune 500 companies that nobody knew existed: "When you have an AI-based attack, it'll find logic flaws rather than code flaws in custom applications. It'll exhaust all routes all the time." "Armadin, since January of this year, we have found over 90 zero-days at customer sites, all in production." "We've post-trained all our models with real red teamers, real folks that actually can develop exploits." "When we're scanning networks, we don't have source code to review. We're not finding these zero-days with source code. We're not finding these zero-days because we can log into an app and now we have access, and we can get to other things. We are black box coming from the internet." "Over 90 zero-days in major software companies, and they're thankful. We're coming from the outside, and then we're calling a CISO, usually within 48 hours, 'Hey, we've got remote code execution in your DMZ.' And usually from there we're getting in, and they agree with us." "That's not a pen test. That is like a real adversary coming at you." @ArmadinSecurity @DavidGeorge832h

    3 Sources

    David George@DavidGeorge83Kevin Mandia says "There's no way to make the next year pretty." He thinks the first time a model revealed itself capable of finding thousands of vulnerabilities, is when everyone finally accepted the game has changed and AI on offense is coming. One of our most sophisticated portcos recently told us they put a significant fraction of their engineers' projects on hold and enlisted them to stress-test their own walls. Kevin's new company @ArmadinSecurity is scaling up to offer this offense-as-defense to everyone, and ultimately build out the autonomous security he believes every company will need in the AI-enabled future.3h
    Sarah Wang@sarahdingwangRT @DavidGeorge83: Kevin Mandia says "There's no way to make the next year pretty." He thinks the first time a model revealed itself capab…3h
    a16z@a16zKevin Mandia on finding 90+ security holes at Fortune 500 companies that nobody knew existed: "When you have an AI-based attack, it'll find logic flaws rather than code flaws in custom applications. It'll exhaust all routes all the time." "Armadin, since January of this year, we have found over 90 zero-days at customer sites, all in production." "We've post-trained all our models with real red teamers, real folks that actually can develop exploits." "When we're scanning networks, we don't have source code to review. We're not finding these zero-days with source code. We're not finding these zero-days because we can log into an app and now we have access, and we can get to other things. We are black box coming from the internet." "Over 90 zero-days in major software companies, and they're thankful. We're coming from the outside, and then we're calling a CISO, usually within 48 hours, 'Hey, we've got remote code execution in your DMZ.' And usually from there we're getting in, and they agree with us." "That's not a pen test. That is like a real adversary coming at you." @ArmadinSecurity @DavidGeorge832h