{"id":1895670,"date":"2026-04-21T22:43:30","date_gmt":"2026-04-21T19:43:30","guid":{"rendered":"https:\/\/analyse.optim.biz\/?p=1895670"},"modified":"2026-04-21T22:43:30","modified_gmt":"2026-04-21T19:43:30","slug":"mozilla-says-it-patched-271-firefox-vulnerabilities-thanks-to-anthropics-claude-mythos","status":"publish","type":"post","link":"https:\/\/analyse.optim.biz\/?p=1895670","title":{"rendered":"Mozilla says it patched 271 Firefox vulnerabilities thanks to Anthropic&#8217;s Claude Mythos"},"content":{"rendered":"<p>[analyse_image type=&#8221;featured&#8221; src=&#8221;https:\/\/s.yimg.com\/ny\/api\/res\/1.2\/odGZubYo5hFkEomtOl9Yww&#8211;\/YXBwaWQ9aGlnaGxhbmRlcjt3PTEyMDA7aD03OTc-\/https:\/\/s.yimg.com\/os\/creatr-images\/2019-06\/621a6ea0-94bd-11e9-b55f-a5806cd8cf19&#8243;]<\/p>\n<article id=\"article-a594aec3-f2b3-4501-8328-fce4636373d7\">\n<div>\n<div class=\"mx-auto md:px-10 md:max-w-[1220px]\">\n<nav class=\"prestige-breadcrumb relative mx-4 md:mx-0\" aria-label=\"breadcrumbs\">\n<ol class=\"no-scrollbar overflow-scroll whitespace-nowrap text-battleship\">\n<li class=\"inline\">\n<li class=\"inline-block cursor-default last:pr-10 md:last:pr-20 font-bold\">AI<\/li>\n<\/ol>\n<\/nav>\n<header class=\"mb-4 px-4 md:mb-6 md:px-0\">\n<h1 class=\"layout-h1 my-2 font-bold leading-tight\">Mozilla says it patched 271 Firefox vulnerabilities thanks to Anthropic&#8217;s Claude Mythos<\/h1>\n<h2 class=\"my-2 text-[18px] font-light leading-5 md:max-w-[660px] md:text-[20px]\/[28px]\">Maybe Project Glasswing isn&#8217;t just hot air.<\/h2>\n<div class=\"flex-col items-start lg:flex lg:flex-row lg:items-center lg:justify-between mt-6\">\n<div class=\"relative md:mr-[10px]\">\n<div class=\"flex items-center\">\n<div class=\"flex mr-2\">\n<div class=\"shrink-0 cursor-pointer inline-block size-[42px] lg:size-[48px]\"><img decoding=\"async\" alt role=\"img\" loading=\"lazy\" class=\"size-full rounded-full object-cover object-center shadow-[0_0_0_2px_#ffffff]\" src=\"https:\/\/s.yimg.com\/ny\/api\/res\/1.2\/VQiGSN1Kr.pEc_y40zHKDA--\/YXBwaWQ9aGlnaGxhbmRlcjt3PTgwO2g9ODA-\/https:\/\/o.aolcdn.com\/images\/dims?image_uri=https%3A%2F%2Fs.yimg.com%2Fos%2Fcreatr-uploaded-images%2F2024-06%2Ff9447100-276f-11ef-beff-781390795172&amp;compress=1&amp;progressive=1&amp;quality=75&amp;client=hawkeye&amp;signature=0128787f6360c6f24bdf06c689658bb57c9760a1\"><\/div>\n<\/div>\n<div class=\"inline-block\">\n<div class=\"w-max text-sm\/5 font-semibold lg:!flex flex items-center\">\n<div class=\"flex flex-col\">\n<div class=\"flex w-max items-center\">Anna Washenko<\/div>\n<p><span class=\"font-normal sm:before:inline-block\">Contributing Reporter<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"lg:hidden\">\n<div class=\"text-xs text-dolphin dark:text-shark md:text-sm\/5 pt-4\">\n<div class=\"inline-block\"><time datetime=\"2026-04-21T22:43:30.000Z\">Tue, April 21, 2026 at 10:43 PM UTC<\/time><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"ml-0 mt-4 flex items-center lg:ml-3 lg:mt-0\">\n<div class=\"ml-0 mr-2\">\n<div class=\"relative flex\">Add Engadget on Google<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"hidden lg:block\">\n<div class=\"text-xs text-dolphin dark:text-shark md:text-sm\/5 pt-4\">\n<div class=\"inline-block\"><time datetime=\"2026-04-21T22:43:30.000Z\">Tue, April 21, 2026 at 10:43 PM UTC<\/time><\/div>\n<\/div>\n<\/div>\n<\/header>\n<\/div>\n<div class=\"grid grid-cols-1 gap-x-8 lg:gap-x-0 mx-auto md:px-10 md:max-w-[1220px] md:grid-cols-[[main-start]_1fr_[main-end_right-start]_min-content_[right-end]] lg:!gap-x-8\">\n<div class=\"md:col-main\" data-i13n-boundary=\"true\">\n<div>\n<div>\n<div class=\"grid grid-cols-[[fullbleed-start_body-start]_minmax(auto,750px)_[body-end_fullbleed-end]]\">\n<figure class=\"relative col-body mb-4\">\n<div class=\"relative overflow-hidden fig-image-round left-1\/2 w-screen -translate-x-1\/2 md:left-0 md:w-auto md:translate-x-0\"><img decoding=\"async\" alt class=\"object-cover object-center\" src=\"https:\/\/s.yimg.com\/ny\/api\/res\/1.2\/_AnA1TaJUEhy3d07BlBYBg--\/YXBwaWQ9aGlnaGxhbmRlcjt3PTEyNDI7aD04MjU-\/https:\/\/s.yimg.com\/os\/creatr-images\/2019-06\/621a6ea0-94bd-11e9-b55f-a5806cd8cf19\"><\/div><figcaption class=\"relative text-[0.875rem]\/[1.25rem] figure-caption mt-1 line-clamp-2 mt-2.5 md:mt-2 pr-2.5\">\n<div><span>Iuliia Serova via Getty Images<\/span><\/div>\n<\/figcaption><\/figure>\n<\/div>\n<\/div>\n<div class=\"grid grid-cols-article-mobile md:grid-cols-article lg:max-w-[750px] drop-cap\" data-article-body=\"true\">\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0 charcoal-color\">Anthropic&#8217;s buzzy announcement about using AI to improve cybersecurity earlier this month was met with plenty of skepticism. However, Mozilla shared some details that support use of the company&#8217;s special Claude Mythos Preview model as a way to protect critical services. Using Mythos helped Mozilla&#8217;s team find and patch 271 vulnerabilities in the latest release of the Firefox browser. &#8220;So far we\u2019ve found no category or complexity of vulnerability that humans can find that this model can\u2019t,&#8221; the foundation said.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0 charcoal-color\">The blog post from Mozilla feels like a positive sign for Anthropic&#8217;s Project Glasswing. Obviously the AI company would want to put itself in the best possible light while presenting its own initiative, but there&#8217;s something encouraging about hearing the benefits from a third party. Mozilla also noted that in its time with Claude Mythos, the AI wasn&#8217;t able to turn up any bugs that a human wouldn&#8217;t have been able to find, given enough time and resources, which indicates that AI isn&#8217;t presently able to do more to crack cybersecurity protections than a person can.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0 charcoal-color\">An organizaion successfully using AI for good is certainly a refreshing change of pace in tech news. And for those Firefox users who aren&#8217;t personally interested in applying any generative AI in their browsing, Mozilla has given the option to turn it all off for the past several months.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"md:col-main grid grid-cols-article-mobile md:grid-cols-article lg:max-w-[750px]\">\n<div class=\"no-scrollbar col-body mx-4 mb-8 mt-2.5 overflow-x-scroll whitespace-nowrap md:mx-0 md:max-w-[750px] md:overflow-x-visible md:hidden\">\n<div class=\"mx-auto max-w-screen-sm\">\n<ul class=\"inline-flex text-xs md:text-sm\">\n<li class=\"mr-6\">About our ads<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<div class=\"grid grid-cols-article-mobile md:grid-cols-article lg:max-w-[750px] drop-cap\" data-article-body=\"true\">\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0 charcoal-color\">Anthropic&#8217;s buzzy announcement about using AI to improve cybersecurity earlier this month was met with plenty of skepticism. However, Mozilla shared some details that support use of the company&#8217;s special Claude Mythos Preview model as a way to protect critical services. Using Mythos helped Mozilla&#8217;s team find and patch 271 vulnerabilities in the latest release of the Firefox browser. &#8220;So far we\u2019ve found no category or complexity of vulnerability that humans can find that this model can\u2019t,&#8221; the foundation said.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0 charcoal-color\">The blog post from Mozilla feels like a positive sign for Anthropic&#8217;s Project Glasswing. Obviously the AI company would want to put itself in the best possible light while presenting its own initiative, but there&#8217;s something encouraging about hearing the benefits from a third party. Mozilla also noted that in its time with Claude Mythos, the AI wasn&#8217;t able to turn up any bugs that a human wouldn&#8217;t have been able to find, given enough time and resources, which indicates that AI isn&#8217;t presently able to do more to crack cybersecurity protections than a person can.<\/p>\n<p class=\"col-body mb-4 leading-7 text-[18px] md:leading-8 break-words min-w-0 charcoal-color\">An organizaion successfully using AI for good is certainly a refreshing change of pace in tech news. And for those Firefox users who aren&#8217;t personally interested in applying any generative AI in their browsing, Mozilla has given the option to turn it all off for the past several months.<\/p>\n<\/div>\n<p>[analyse_source url=&#8221;https:\/\/www.engadget.com\/ai\/mozilla-says-it-patched-271-firefox-vulnerabilities-thanks-to-anthropics-claude-mythos-224330023.html&#8221;]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[analyse_image type=&#8221;featured&#8221; src=&#8221;https:\/\/s.yimg.com\/ny\/api\/res\/1.2\/odGZubYo5hFkEomtOl9Yww&#8211;\/YXBwaWQ9aGlnaGxhbmRlcjt3PTEyMDA7aD03OTc-\/https:\/\/s.yimg.com\/os\/creatr-images\/2019-06\/621a6ea0-94bd-11e9-b55f-a5806cd8cf19&#8243;] AI Mozilla says it patched 271 Firefox vulnerabilities thanks to Anthropic&#8217;s Claude Mythos Maybe Project Glasswing isn&#8217;t just hot air. Anna Washenko Contributing Reporter Tue, April 21, 2026 at 10:43 PM UTC Add Engadget on Google Tue, April 21, 2026 at 10:43 PM UTC Iuliia Serova via Getty Images Anthropic&#8217;s buzzy announcement [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[226,63],"class_list":["post-1895670","post","type-post","status-publish","format-standard","hentry","category-politics","tag-crawlmanager","tag-engadget-com"],"_links":{"self":[{"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/posts\/1895670","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1895670"}],"version-history":[{"count":0,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/posts\/1895670\/revisions"}],"wp:attachment":[{"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1895670"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1895670"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1895670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}