{"id":244026,"date":"2026-07-09T20:52:55","date_gmt":"2026-07-09T20:52:55","guid":{"rendered":"https:\/\/ushopwell.com\/ublog\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\/"},"modified":"2026-07-09T20:52:55","modified_gmt":"2026-07-09T20:52:55","slug":"patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk","status":"publish","type":"post","link":"https:\/\/ushopwell.com\/ublog\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\/","title":{"rendered":"Patch for Windows Defender 0-day could allow attackers to fill hard disk"},"content":{"rendered":"<div>\n<p>A patch Microsoft released on Wednesday to fix a zero-day vulnerability in its Defender security engine may cause Windows machines to write files large enough to completely consume available disk space, the researcher who discovered the flaw said.<\/p>\n<p>RoguePlanet, tracked as CVE-2026-50656, came to public notice <a href=\"https:\/\/arstechnica.com\/security\/2026\/07\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\/\">in June<\/a> when NightmareEclipse, the pseudonymous name used by a researcher, disclosed it along with <a href=\"https:\/\/git.projectnightcrawler.dev\/NightmareEclipse\/RoguePlanet\">code<\/a> for exploiting it. The vulnerability allows remote attackers to gain administrative control of Windows 10 and Windows 11 machines, even when real-time protection has been disabled. Over the past few months, the anonymous researcher has published a <a href=\"https:\/\/arstechnica.com\/security\/2026\/05\/zero-day-exploit-completely-defeats-default-windows-11-bitlocker-protections\/\">handful<\/a> of <a href=\"https:\/\/arstechnica.com\/security\/2026\/06\/locked-in-heated-rivalry-with-researcher-microsoft-fixes-0-day-they-disclosed\/\">other<\/a> zero-days that have sent Microsoft scrambling to develop patches.<\/p>\n<h2>Writing files of unlimited size<\/h2>\n<p>Microsoft <a href=\"https:\/\/msrc.microsoft.com\/update-guide\/en-US\/advisory\/CVE-2026-50656\">said<\/a> Wednesday that it patched RoguePlanet with an update to the Microsoft Malware Protection Engine, which is used by the Defender antivirus app. The fix will automatically be downloaded and installed without users having to take any action. Wednesday\u2019s update also includes \u201cdefense-in-depth updates to help improve security-related features.\u201d<\/p>\n<p><a href=\"https:\/\/arstechnica.com\/security\/2026\/07\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\/\">Read full article<\/a><\/p>\n<p><a href=\"https:\/\/arstechnica.com\/security\/2026\/07\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\/#comments\">Comments<\/a><\/p>\n<\/div>\n<p class=\"wpematico_credit\"><small>Powered by <a href=\"http:\/\/www.wpematico.com\" target=\"_blank\">WPeMatico<\/a><\/small><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A patch Microsoft released on Wednesday to fix a zero-day vulnerability in its Defender security engine may cause Windows machines to write files large enough to completely consume available disk space, the researcher who discovered the flaw said. RoguePlanet, tracked as CVE-2026-50656, came to public notice in June when NightmareEclipse, the pseudonymous name used by a researcher, disclosed it along with code for exploiting it. The vulnerability allows remote attackers&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","tve_updated_post":"","tve_custom_css":"","tve_user_custom_css":"","tve_globals":{},"tcb2_ready":0,"tcb_editor_enabled":0,"tve_landing_page":"","_tve_header":"","_tve_footer":""},"categories":[241],"tags":[],"class_list":["post-244026","post","type-post","status-publish","format-standard","hentry","category-technology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Patch for Windows Defender 0-day could allow attackers to fill hard disk - UshopWell.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ushopwell.com\/ublog\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Patch for Windows Defender 0-day could allow attackers to fill hard disk - UshopWell.com\" \/>\n<meta property=\"og:description\" content=\"A patch Microsoft released on Wednesday to fix a zero-day vulnerability in its Defender security engine may cause Windows machines to write files large enough to completely consume available disk space, the researcher who discovered the flaw said. RoguePlanet, tracked as CVE-2026-50656, came to public notice in June when NightmareEclipse, the pseudonymous name used by a researcher, disclosed it along with code for exploiting it. The vulnerability allows remote attackers...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ushopwell.com\/ublog\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\/\" \/>\n<meta property=\"og:site_name\" content=\"UshopWell.com\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-09T20:52:55+00:00\" \/>\n<meta name=\"author\" content=\"UShopWell\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"UShopWell\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/ushopwell.com\\\/ublog\\\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/ushopwell.com\\\/ublog\\\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\\\/\"},\"author\":{\"name\":\"UShopWell\",\"@id\":\"https:\\\/\\\/ushopwell.com\\\/ublog\\\/#\\\/schema\\\/person\\\/6fd1f9e0ff932e534c86c70d5acff0fc\"},\"headline\":\"Patch for Windows Defender 0-day could allow attackers to fill hard disk\",\"datePublished\":\"2026-07-09T20:52:55+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/ushopwell.com\\\/ublog\\\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\\\/\"},\"wordCount\":185,\"publisher\":{\"@id\":\"https:\\\/\\\/ushopwell.com\\\/ublog\\\/#organization\"},\"articleSection\":[\"Technology\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/ushopwell.com\\\/ublog\\\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\\\/\",\"url\":\"https:\\\/\\\/ushopwell.com\\\/ublog\\\/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk\\\/\",\"name\":\"Patch for Windows Defender 0-day could allow attackers to fill hard disk - 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RoguePlanet, tracked as CVE-2026-50656, came to public notice in June when NightmareEclipse, the pseudonymous name used by a researcher, disclosed it along with code for exploiting it. 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