Here\u2019s how cyber heavyweights in the US and UK are dealing with Claude Mythos | CyberScoop<\/title> <meta name=\"description\" content=\"Two reports from former high-level U.S. cyber officials and the UK government\u2019s top AI research institution reveal how top defenders think about the tool\u2019s hacking capabilities.\"> <link rel=\"canonical\" href=\"https:\/\/cyberscoop.com\/claude-mythos-ai-cybersecurity-threat-report\/\"> <meta property=\"og:locale\" content=\"en_US\"> <meta property=\"og:type\" content=\"article\"> <meta property=\"og:title\" content=\"Here\u2019s how cyber heavyweights in the US and UK are dealing with Claude Mythos\"> <meta property=\"og:description\" content=\"Two reports from former high-level U.S. cyber officials and the UK government\u2019s top AI research institution reveal how top defenders think about the tool\u2019s hacking capabilities.\"> <meta property=\"og:url\" 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class=\"ad ad--top ad--top-mobile\">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<section id=\"stickybar\" class=\"stickybar stickybar--newsletter js-stickybar\" readability=\"0.82\"> <button class=\"stickybar__close js-stickybar-close\" aria-controls=\"stickybar\"> <svg class=\"icon icon--close\" width=\"21\" height=\"22\" viewBox=\"0 0 21 22\" fill=\"none\"><path d=\"m.822.518-.805.805L9.695 11 .017 20.678l.805.805 9.678-9.678 9.677 9.678.806-.805L11.305 11l9.678-9.677-.806-.805-9.677 9.677L.822.518Z\" fill=\"currentColor\" \/><\/svg> <span class=\"visually-hidden\">Close<\/span> <\/button> <\/section>\n<article class=\"single-article content\">\n<div class=\"single-article__container js-single-article-content\">\n<header class=\"single-article__header \" readability=\"25.956719817768\">\n<div class=\"single-article__header-content\" readability=\"34.569536423841\">\n<p> Two reports from former high-level U.S. cyber officials and the UK government\u2019s top AI research institution reveal how top defenders think about the tool\u2019s hacking capabilities. <\/p>\n<p>  <br \/>\n<audio id=\"audio-player\" src=\"https:\/\/wp-tts-cdn.api.scpnewsgrp.com\/cyberscoop\/88578\/english.openai.mp3\"><\/audio> <\/p>\n<div readability=\"11\">\n<div>\n<p>Listen to this article<\/p>\n<p>  <\/p>\n<p>0:00<\/p>\n<\/p><\/div>\n<p>  <\/p>\n<p> <span id=\"tts-tooltip\">Learn more.<\/span> <span> This feature uses an automated voice, which may result in occasional errors in pronunciation, tone, or sentiment. <\/span> <\/p>\n<\/div>\n<p>  <\/div>\n<div class=\"single-article__cover-wrap\">\n<figure class=\"single-article__cover\"> <img data-recalc-dims=\"1\" fetchpriority=\"high\" width=\"640\" height=\"426\" src=\"https:\/\/i0.wp.com\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos.jpg?resize=640%2C426&ssl=1\" class=\"single-article__cover-image wp-post-image\" alt decoding=\"async\" fetchpriority=\"high\" srcset=\"https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg 8256w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=300,200 300w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=768,512 768w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=1024,683 1024w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=1536,1024 1536w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=2048,1365 2048w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=600,400 600w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=252,168 252w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=506,337 506w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=1013,675 1013w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.jpg?resize=1265,843 1265w\" sizes=\"(max-width: 1013px) 100vw, 1013px\"><figcaption> Anthropic’s Project Glasswing website is displayed on a smartphone screen in this photo illustration in Brussels, Belgium, on April 12, 2026. Governments and financial institutions are reviewing potential cybersecurity risks from the company’s advanced AI model, which has identified thousands of software vulnerabilities but is restricted over misuse concerns. (Photo Illustration by Jonathan Raa\/NurPhoto via Getty Images) <\/figcaption><\/figure>\n<\/p><\/div>\n<\/header>\n<div class=\"single-article__content\">\n<div class=\"single-article__content-inner has-drop-cap\"> <html readability=\"69.667650365374\"><body readability=\"142.94885745375\"><\/p>\n<p>A joint <a href=\"https:\/\/labs.cloudsecurityalliance.org\/wp-content\/uploads\/2026\/04\/mythosready-20260413.pdf\">report<\/a> from the Cloud Security Alliance (CSA), the SANS Institute and the Open Worldwide Application Security Project (OWASP) concludes that in the near term, organizations are \u201clikely to be overwhelmed\u201d by threat actors using AI to find and exploit vulnerabilities faster than defenders can patch them.<\/p>\n<p>While those organizations can use AI tools to speed up their own defenses, attackers \u201cstill face a heavier relative burden due to the inherent limitations of patching. This in turn leads to \u201casymmetric benefits\u201d for attackers who can afford to adopt the technology without the same caution and bureaucracy as a multi-billion dollar business.<\/p>\n<p>\u201cThe cost and capability floor to exploit discovery is dropping, the time between disclosure and weaponization is compressing toward zero, and capabilities that previously required nation-state resources are now becoming broadly accessible,\u201d wrote Robert Lee, SANS Institute\u2019s Chief AI Officer, Gadi Evron, CEO of Knostic and Rich Mogull, chief analyst at CSA, who served as the primary authors.<\/p>\n<p>The report marks one of the first comprehensive responses to the capabilities of Claude Mythos from the U.S., boasting cybersecurity luminaries who have set policy at the highest levels as contributing authors, including Jen Easterly, former director of the Cybersecurity and Infrastructure Security Agency, Rob Joyce, a former top White House and NSA cybersecurity official, and Chris Inglis, former National Cyber Director.<\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>It also includes private sector stalwarts like Heather Adkins, Google\u2019s CISO, Katie Moussouris, CEO of Luta Security, and Sounil Yu, chief technology officer at Knostic. Another seventy CISOs, CTOs and other security executives are named as editors and reviewers.<\/p>\n<p>Also this week, the UK\u2019s AI Security Institute (AISI) <a href=\"https:\/\/www.aisi.gov.uk\/blog\/our-evaluation-of-claude-mythos-previews-cyber-capabilities\">detailed<\/a> the results of tests it performed on a preview version of Claude Mythos, calling it a \u201cstep up\u201d from past Anthropic models in the cybersecurity arena and able to \u201cexecute multi-stage attacks on vulnerable networks and discover and exploit vulnerabilities autonomously.\u201d<\/p>\n<p>Using a mix of Capture the Flag exercises and cyber range testing, AISI researchers found that Mythos not only raised the ceiling of technical non-experts and apprentice-level users, it narrowed the overall gap in hacking proficiency between the two. In other words, there\u2019s becoming less of a distinction between the capabilities of amateur \u201cscript kiddies\u201d and mid-level hackers with technical knowledge.<\/p>\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" height=\"349\" width=\"640\" src=\"https:\/\/i0.wp.com\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos.png?resize=640%2C349&ssl=1\" alt class=\"wp-image-88580\" srcset=\"https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.png 1432w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.png?resize=300,163 300w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.png?resize=768,418 768w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.png?resize=1024,558 1024w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.png?resize=600,327 600w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-2.png?resize=1200,654 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Claude Mythos and other Large Language Models are increasing the capabilities of both lower and mid-level hackers when it comes to solving cybersecurity-specific tasks and challenges. (Source: AISI)<\/figcaption><\/figure>\n<p>Before April 2025, no Large Language Model could complete a single expert-level CTF problem. Mythos successfully solved nearly three quarters (73%) of them.<\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>In cyber range tests \u2013 which are meant to simulate more complex, multi-chain attacks \u2013 the results were uneven, but also represented meaningful progress over prior Claude models.<\/p>\n<p>Mythos was subjected to a 32-step attack playbook modeled on corporate networks, spanning initial network access to full network takeover. In three of the 10 simulations, the model completed an average of 24 of the 32 steps. Older versions of Claude and other frontier models never averaged more than 16.<\/p>\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" height=\"381\" width=\"640\" src=\"https:\/\/i0.wp.com\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-1.png?resize=640%2C381&ssl=1\" alt class=\"wp-image-88579\" srcset=\"https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-3.png 1429w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-3.png?resize=300,179 300w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-3.png?resize=768,457 768w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-3.png?resize=1024,610 1024w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-3.png?resize=600,357 600w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-3.png?resize=282,168 282w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-3.png?resize=566,337 566w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-3.png?resize=1133,675 1133w, https:\/\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-3.png?resize=1416,843 1416w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Claude Mythos improved on other models ability to complete a 32 step cyber attack targeting a simulated corporate network environment. (Source: AISI)<\/figcaption><\/figure>\n<p>Mythos flunked its test against a simulated operational technology cooling tower, but researchers noted that this doesn\u2019t mean AI is bad at exploiting OT: the model actually faltered during the IT section of the exercise.<\/p>\n<p>UK researchers were more measured in their analysis of Mythos, noting that their testing indicates it is \u201cat least capable\u201d of autonomously taking down smaller, weakly defended enterprise networks.<\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>But they also note their cyber ranges lack security features \u2013 like active defenders and defensive tooling \u2013 that would be common in many real-world networks and present additional obstacles, nor did they penalize the model for triggering security alerts.<\/p>\n<p>\u201cThis means we cannot say for sure whether Mythos Preview would be able to attack well-defended systems,\u201d the researchers concluded.<\/p>\n<h4 class=\"wp-block-heading\" id=\"h-technical-debt-coming-due\">Technical debt coming due <\/h4>\n<p>Both the US and UK reports agree that large language models are <a href=\"https:\/\/cyberscoop.com\/ai-cyberattacks-two-years-insane-vulnerabilities-kevin-mandia-alex-stamos-morgan-adamski-rsac-2026\/\">broadly moving in a similar direction<\/a> of lowering the technical barrier. The US authors call for organizations to more quickly adopt AI for cyber defense while overhauling their incident response playbooks and corporate policies to account for more automated defense postures.<\/p>\n<p>For its part, Anthropic has said it is not selling Mythos commercially, and last week it announced the model would be <a href=\"https:\/\/cyberscoop.com\/project-glasswing-anthropic-ai-open-source-software-vulnerabilities\/\">made available to Project Glasswing<\/a>, a consortium of major tech companies that will use it to root out and patch vulnerabilities in commonly used products and services. <\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>But other experts have warned that businesses and governments are not well-positioned to either absorb the influx of expected vulnerability exploitation or deftly harness AI tools of their own to counter them.<\/p>\n<p>Casey Ellis, CTO and founder of Bugcrowd, <a href=\"https:\/\/cje.io\/2026\/04\/08\/offense-scales-with-compute-defense-scales-with-committees\/\">wrote<\/a> that recent advances in AI cyber tools has succeeded largely by \u201cliving in the places we stopped looking a decade ago.\u201d<\/p>\n<p>While the cybersecurity community has spent years focusing on application security, vulnerability triage and other \u201ctop layer\u201d security problems, AI tools and apex level hacking groups have been feasting on vulnerabilities in forgotten firmware, or routers whose manufacturers long went out of business.<\/p>\n<p>This reality that tools like Mythos can endlessly weaponize the massive technical debt of large organizations has taken the traditional defender\u2019s dilemma and \u201cthe knob that used to go to ten and turned it to seven hundred,\u201d Ellis wrote.<\/p>\n<p>Additionally, corporations and governments run on consensus-building, multiple layers of hierarchy and legal compliance. While those are all necessary when handing your cybersecurity over to automated tooling, it can also lead to a slower process and more asymmetry against defenders in the short term.<\/p>\n<div class=\"ad ad--inline_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<p>\u201cIntegration into actual production becomes the battlezone,\u201d wrote Ellis. \u201cLag is real. Bureaucracy is real. Supply chains are real.\u201d<\/p>\n<p><\/body> <\/p>\n<footer class=\"single-article__footer\" readability=\"2.9032258064516\">\n<div class=\"author-card\" readability=\"13\">\n<div class=\"author-card__avatar\">\n<figure class=\"author-card__image-wrap\"> <img data-recalc-dims=\"1\" decoding=\"async\" class=\"author-card__image\" src=\"https:\/\/i0.wp.com\/ddi.mohflo.net\/wp-content\/uploads\/2026\/04\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos-1.jpg?w=640&ssl=1\" alt=\"Derek B. Johnson\"> <\/figure>\n<\/p><\/div>\n<p><h4 class=\"author-card__name\">Written by Derek B. Johnson<\/h4>\n<p> Derek B. Johnson is a reporter at CyberScoop, where his beat includes cybersecurity, elections and the federal government. Prior to that, he has provided award-winning coverage of cybersecurity news across the public and private sectors for various publications since 2017. Derek has a bachelor\u2019s degree in print journalism from Hofstra University in New York and a master\u2019s degree in public policy from George Mason University in Virginia. <\/p>\n<\/p><\/div>\n<div class=\"single-article__tags-container\">\n<h4 class=\"single-article__tags-title\">In This Story<\/h4>\n<\/p><\/div>\n<\/footer>\n<p> <\/html><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div class=\"single-article__ads js-single-article-sidebar\">\n<div class=\"ad ad--sidebar js-single-article-sidebar-5 ad--rightrail_1 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<div class=\"ad ad--sidebar js-single-article-sidebar-4 ad--rightrail_2 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> <\/div>\n<\/div>\n<div class=\"ad ad--sidebar js-single-article-sidebar-3 ad--rightrail_3 \">\n<div class=\"ad__inner\"> <span class=\"screen-reader-text\">Advertisement<\/span> 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{"id":8524,"date":"2026-04-13T16:43:37","date_gmt":"2026-04-13T21:43:37","guid":{"rendered":"https:\/\/cyberscoop.com\/?p=88578"},"modified":"2026-04-13T16:43:37","modified_gmt":"2026-04-13T21:43:37","slug":"heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos","status":"publish","type":"post","link":"https:\/\/ddi.mohflo.net\/index.php\/2026\/04\/13\/heres-how-cyber-heavyweights-in-the-us-and-uk-are-dealing-with-claude-mythos\/","title":{"rendered":"Here\u2019s how cyber heavyweights in the US and UK are dealing with Claude Mythos"},"content":{"rendered":"