{"id":3796,"date":"2026-06-22T15:06:24","date_gmt":"2026-06-22T15:06:24","guid":{"rendered":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/"},"modified":"2026-06-22T15:06:24","modified_gmt":"2026-06-22T15:06:24","slug":"29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests","status":"publish","type":"post","link":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/","title":{"rendered":"29-Year-Old Squid Proxy Bug &#8216;Squidbleed&#8217; Can Leak Cleartext HTTP Requests"},"content":{"rendered":"<div>A heap over-read in the Squid web proxy can leak another user&#8217;s cleartext HTTP request, including any credentials or session tokens it carries, to anyone already allowed to send traffic through the same proxy.<\/p>\n<p>The bug traces to a 1997 FTP-parsing change and is still live in Squid&#8217;s default configuration. Researchers at Calif.io\u00a0disclosed it in June\u00a0and named it Squidbleed (<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>A heap over-read in the Squid web proxy can leak another user&#8217;s cleartext HTTP request, including any credentials or session tokens it carries, to anyone already allowed to send traffic through the same proxy. The bug traces to a 1997 FTP-parsing change and is still live in Squid&#8217;s default configuration. Researchers at Calif.io\u00a0disclosed it in [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-container-style":"default","site-container-layout":"default","site-sidebar-layout":"default","disable-article-header":"default","disable-site-header":"default","disable-site-footer":"default","disable-content-area-spacing":"default","footnotes":""},"categories":[90],"tags":[91],"class_list":["post-3796","post","type-post","status-publish","format-standard","hentry","category-cybersecurity","tag-cybersecurity"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>29-Year-Old Squid Proxy Bug &#039;Squidbleed&#039; Can Leak Cleartext HTTP Requests - Imperative Business Ventures Limited<\/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:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"29-Year-Old Squid Proxy Bug &#039;Squidbleed&#039; Can Leak Cleartext HTTP Requests - Imperative Business Ventures Limited\" \/>\n<meta property=\"og:description\" content=\"A heap over-read in the Squid web proxy can leak another user&#8217;s cleartext HTTP request, including any credentials or session tokens it carries, to anyone already allowed to send traffic through the same proxy. The bug traces to a 1997 FTP-parsing change and is still live in Squid&#8217;s default configuration. Researchers at Calif.io\u00a0disclosed it in [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/\" \/>\n<meta property=\"og:site_name\" content=\"Imperative Business Ventures Limited\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-22T15:06:24+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\/\/blog.ibvl.in\/#\/schema\/person\/55b87b72a56b1bbe9295fe5ef7a20b02\"},\"headline\":\"29-Year-Old Squid Proxy Bug &#8216;Squidbleed&#8217; Can Leak Cleartext HTTP Requests\",\"datePublished\":\"2026-06-22T15:06:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/\"},\"wordCount\":73,\"keywords\":[\"Cybersecurity\"],\"articleSection\":[\"Cybersecurity\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/\",\"url\":\"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/\",\"name\":\"29-Year-Old Squid Proxy Bug 'Squidbleed' Can Leak Cleartext HTTP Requests - Imperative Business Ventures Limited\",\"isPartOf\":{\"@id\":\"https:\/\/blog.ibvl.in\/#website\"},\"datePublished\":\"2026-06-22T15:06:24+00:00\",\"author\":{\"@id\":\"https:\/\/blog.ibvl.in\/#\/schema\/person\/55b87b72a56b1bbe9295fe5ef7a20b02\"},\"breadcrumb\":{\"@id\":\"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/blog.ibvl.in\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"29-Year-Old Squid Proxy Bug &#8216;Squidbleed&#8217; Can Leak Cleartext HTTP Requests\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blog.ibvl.in\/#website\",\"url\":\"https:\/\/blog.ibvl.in\/\",\"name\":\"Imperative Business Ventures Limited\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/blog.ibvl.in\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/blog.ibvl.in\/#\/schema\/person\/55b87b72a56b1bbe9295fe5ef7a20b02\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/blog.ibvl.in\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/4d20b2cd313e4417a599678e950e6fb7d4dfa178a72f2b769335a08aaa615aa9?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/4d20b2cd313e4417a599678e950e6fb7d4dfa178a72f2b769335a08aaa615aa9?s=96&d=mm&r=g\",\"caption\":\"admin\"},\"sameAs\":[\"https:\/\/blog.ibvl.in\"],\"url\":\"https:\/\/blog.ibvl.in\/index.php\/author\/admin_hcbs9yw6\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"29-Year-Old Squid Proxy Bug 'Squidbleed' Can Leak Cleartext HTTP Requests - Imperative Business Ventures Limited","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/","og_locale":"en_US","og_type":"article","og_title":"29-Year-Old Squid Proxy Bug 'Squidbleed' Can Leak Cleartext HTTP Requests - Imperative Business Ventures Limited","og_description":"A heap over-read in the Squid web proxy can leak another user&#8217;s cleartext HTTP request, including any credentials or session tokens it carries, to anyone already allowed to send traffic through the same proxy. The bug traces to a 1997 FTP-parsing change and is still live in Squid&#8217;s default configuration. Researchers at Calif.io\u00a0disclosed it in [&hellip;]","og_url":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/","og_site_name":"Imperative Business Ventures Limited","article_published_time":"2026-06-22T15:06:24+00:00","author":"admin","twitter_card":"summary_large_image","twitter_misc":{"Written by":"admin"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/#article","isPartOf":{"@id":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/"},"author":{"name":"admin","@id":"https:\/\/blog.ibvl.in\/#\/schema\/person\/55b87b72a56b1bbe9295fe5ef7a20b02"},"headline":"29-Year-Old Squid Proxy Bug &#8216;Squidbleed&#8217; Can Leak Cleartext HTTP Requests","datePublished":"2026-06-22T15:06:24+00:00","mainEntityOfPage":{"@id":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/"},"wordCount":73,"keywords":["Cybersecurity"],"articleSection":["Cybersecurity"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/","url":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/","name":"29-Year-Old Squid Proxy Bug 'Squidbleed' Can Leak Cleartext HTTP Requests - Imperative Business Ventures Limited","isPartOf":{"@id":"https:\/\/blog.ibvl.in\/#website"},"datePublished":"2026-06-22T15:06:24+00:00","author":{"@id":"https:\/\/blog.ibvl.in\/#\/schema\/person\/55b87b72a56b1bbe9295fe5ef7a20b02"},"breadcrumb":{"@id":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/blog.ibvl.in\/index.php\/2026\/06\/22\/29-year-old-squid-proxy-bug-squidbleed-can-leak-cleartext-http-requests\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/blog.ibvl.in\/"},{"@type":"ListItem","position":2,"name":"29-Year-Old Squid Proxy Bug &#8216;Squidbleed&#8217; Can Leak Cleartext HTTP Requests"}]},{"@type":"WebSite","@id":"https:\/\/blog.ibvl.in\/#website","url":"https:\/\/blog.ibvl.in\/","name":"Imperative Business Ventures Limited","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/blog.ibvl.in\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/blog.ibvl.in\/#\/schema\/person\/55b87b72a56b1bbe9295fe5ef7a20b02","name":"admin","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/blog.ibvl.in\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/4d20b2cd313e4417a599678e950e6fb7d4dfa178a72f2b769335a08aaa615aa9?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/4d20b2cd313e4417a599678e950e6fb7d4dfa178a72f2b769335a08aaa615aa9?s=96&d=mm&r=g","caption":"admin"},"sameAs":["https:\/\/blog.ibvl.in"],"url":"https:\/\/blog.ibvl.in\/index.php\/author\/admin_hcbs9yw6\/"}]}},"_links":{"self":[{"href":"https:\/\/blog.ibvl.in\/index.php\/wp-json\/wp\/v2\/posts\/3796","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.ibvl.in\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.ibvl.in\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.ibvl.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.ibvl.in\/index.php\/wp-json\/wp\/v2\/comments?post=3796"}],"version-history":[{"count":0,"href":"https:\/\/blog.ibvl.in\/index.php\/wp-json\/wp\/v2\/posts\/3796\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.ibvl.in\/index.php\/wp-json\/wp\/v2\/media?parent=3796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.ibvl.in\/index.php\/wp-json\/wp\/v2\/categories?post=3796"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.ibvl.in\/index.php\/wp-json\/wp\/v2\/tags?post=3796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}