{"id":101116,"date":"2025-04-11T05:11:50","date_gmt":"2025-04-11T03:11:50","guid":{"rendered":"https:\/\/staging.checkmarx.com\/?p=101116"},"modified":"2026-04-10T20:37:12","modified_gmt":"2026-04-10T18:37:12","slug":"the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software","status":"publish","type":"post","link":"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/","title":{"rendered":"The AppSec Manager&#8217;s Guide to Understanding the Hidden Threats of Malicious Code in Open-Source Software"},"content":{"rendered":"<p>Open-source software (OSS) can be a lifesaver. It&#8217;s fast, efficient, and ultimately helpful to push products out quicker. But here&#8217;s the catch: Open source isn&#8217;t just a valuable resource, it&#8217;s also a goldmine for attackers who know exactly where to strike. As OSS adoption skyrockets, understanding how to <a href=\"https:\/\/checkmarx.com\/glossary\/malicious-code\/\">uncover the hidden threats of malicious code<\/a> isn&#8217;t just smart. It&#8217;s survival.<\/p>\n\n\n\n<h2 class=\"wp-block-heading article-anchor\" id=\"article-anchor-1\"><strong>Malicious Open-Source Attacks: Meet the Usual Suspects<\/strong><\/h2>\n\n\n\n<p>Here&#8217;s a look into three sneaky types of attacks targeting open-source software vulnerabilities that might ruin your day if you&#8217;re not careful.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Dependency Confusion: Internal vs. External Chaos<\/strong><\/h3>\n\n\n\n<p>Dependency confusion is when your automated build fetches a public version instead of your trusted internal one, and it&#8217;s exactly as messy as it sounds.<\/p>\n\n\n\n<p>Attackers exploit packages of the same name between private (internal) repositories and public ones, tricking package managers into downloading malicious packages that masquerade as legitimate internal packages. Here\u2019s how it typically goes down:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\n<strong>Internal Package Spoofing<\/strong>: Say you have an internal package called company-infra. An attacker might publish a malicious package with that same name on a public repository, but with a suspiciously high version number, like v999.999.999. Because many package managers default to fetching the highest version, you\u2019re suddenly pulling malicious code instead of your trusted internal package.<br>\n<\/li>\n\n\n\n<li>\n<strong>Version Inflation Attacks<\/strong>: Attackers don&#8217;t even need to guess blindly. Sometimes they&#8217;ll scrape public GitHub repositories for dependency files (package.json, requirements.txt) to discover the names of your internal packages. Once discovered, they upload malicious packages using these exact names but higher version numbers to public repositories, baiting your build servers into downloading their payloads.<br>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>Pro tip for protection<\/strong>: Register placeholder packages with the same names as your internal ones on public repositories with intentionally low version numbers. This prevents attackers from claiming the package names and tricking your build tools. Other defensive options are namespace prefixing, version pinning, and configuring package managers to prioritize private repositories.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Typosquatting: When One Letter Costs You Everything<\/strong><\/h3>\n\n\n\n<p>Imagine you&#8217;re exhausted, on your fourth coffee, and accidentally type \u201celectorn\u201d instead of \u201celectron.\u201d That tiny slip-up? It just downloaded a malicious package onto your dev machine. Welcome to the sneaky world of typosquatting where attackers bank on human mistakes.<\/p>\n\n\n\n<p>Common typosquatting techniques include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\n<strong>Combosquatting<\/strong>: Appending common words or letters to legitimate packages, e.g., \u201clodash\u201d becomes \u201clodashs.\u201d Sounds legit, right?<\/li>\n\n\n\n<li>\n<strong>Omission<\/strong>: Leaving out a letter or hyphen, turning \u201ccross-env\u201d into \u201ccrossenv.\u201d Harmless typo? Think again.<\/li>\n\n\n\n<li>\n<strong>Repetition<\/strong>: Sneaking in extra letters, like typing \u201cjquerry\u201d instead of \u201cjquery.\u201d Because who hasn&#8217;t held a key down too long?<\/li>\n\n\n\n<li>\n<strong>Transposition<\/strong>: Swapping adjacent letters, like the classic \u201celectron\u201d vs. \u201celectorn\u201d.<\/li>\n<\/ul>\n\n\n\n<p>Typosquatting is tough to spot because it preys on developer fatigue and multitasking. Attackers count on developers\u2019 busy schedules and tired eyes to overlook tiny naming discrepancies.<\/p>\n\n\n\n<p><strong>Pro tip for protection<\/strong>: Leverage advanced Software Composition Analysis (SCA) tools capable of detecting suspicious OSS packages, rather than relying solely on specific names and human vigilance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. RepoJacking: Hijacking Repositories One Rename at a Time<\/strong><\/h3>\n\n\n\n<p>Picture this: your favorite GitHub repo suddenly renames itself. No big deal, right? Wrong. It&#8217;s actually the first domino falling in a potential attack called Repository Jacking, or RepoJacking. Here\u2019s the sneaky trick attackers pull:<\/p>\n\n\n\n<p>GitHub has a nifty feature called &#8220;Repository Redirects,&#8221; which automatically redirects users when repos or usernames are changed. Handy? Yes. Safe? Not always.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Let&#8217;s say GitHub user Annastacia publishes a popular Go package at github.com\/Annastacia\/useful.<\/li>\n\n\n\n<li>Later, Annastacia shortens her username to Anna. GitHub automatically redirects requests from the old username (Annastacia) to the new one (Anna). So far, so good.<\/li>\n\n\n\n<li>But here&#8217;s the kicker: GitHub frees up the old username (Annastacia) for anyone to claim. Attackers jump at the chance, registering that abandoned username and setting up a malicious repo with the same original repository name (useful).<\/li>\n\n\n\n<li>Suddenly, anyone relying on the original URL downloads the malicious version instead. Chaos ensues.<\/li>\n<\/ul>\n\n\n\n<p>The simplicity of username changes on GitHub means attackers don&#8217;t have to break in. They just wait for usernames to free up and jump in to exploit trust built over time.<\/p>\n\n\n\n<p><strong>Pro tip for protection<\/strong>: Use automated scanning tools like Checkmarx SCA to proactively identify vulnerable dependencies.<\/p>\n\n\n\n<h2 class=\"wp-block-heading article-anchor\" id=\"article-anchor-2\"><strong>Detecting and Preventing Malicious Packages and Code: Your Tactical Game Plan<\/strong><\/h2>\n\n\n\n<p>Let&#8217;s talk about solutions. Here&#8217;s a step-by-step guide to locking down your OSS supply chain:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 1: Visibility First<\/strong><\/h3>\n\n\n\n<p>Know exactly what OSS you&#8217;re using. If you don&#8217;t know your stack, you can&#8217;t protect it. Use SBOMs and SCA tools that don&#8217;t just scan for known vulnerabilities, but also detect anomalies indicative of typosquatting or dependency confusion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 2: Secure Internal Repositories<\/strong><\/h3>\n\n\n\n<p>Minimize dependency confusion by locking down your package manager configurations. Ensure your internal repositories take precedence, and register placeholder packages in public repositories to block attackers from using your package names.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 3: Double-check Versions<\/strong><\/h3>\n\n\n\n<p>Malicious actors love inflating version numbers. Configure your build environment to strictly manage and approve version updates. Better yet, create checksums or lock files to verify package integrity explicitly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 4: Automation Is Your Friend<\/strong><\/h3>\n\n\n\n<p>Automate vulnerability and malicious code detection in your CI\/CD pipelines. Tools like Checkmarx SCA can spot typosquatting packages and other suspicious anomalies before they reach production.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 5: Protect Against RepoJacking<\/strong><\/h3>\n\n\n\n<p>Avoid using retired namespaces to minimize the attack surface, and use <a href=\"https:\/\/checkmarx.com\/learn\/supply-chain-security\/understanding-software-bill-of-materials-sbom\/\">SBOMs<\/a> and <a href=\"https:\/\/checkmarx.com\/learn\/software-composition-analysis\/software-composition-analysis-sca\/\">SCA<\/a> tools to regularly audit your repositories.<\/p>\n\n\n\n<h2 class=\"wp-block-heading article-anchor\" id=\"article-anchor-3\"><strong>Wrapping Up: Vigilance Plus Checkmarx, the Ultimate Defense Combo<\/strong><\/h2>\n\n\n\n<p>Look, nobody wants to be &#8220;that manager&#8221; whose codebase becomes the cautionary tale at conferences. OSS isn&#8217;t going anywhere, and neither are the attackers, so it\u2019s best to stay sharp and stay informed on the risks of <a href=\"https:\/\/checkmarx.com\/learn\/supply-chain-security\/malicious-code-guide\/\">malicious code<\/a>. Explore how <a href=\"https:\/\/checkmarx.com\/solutions\/software-supply-chain-security\/\">Checkmarx One<\/a> can mitigate the risk of OSS with its unified, end-to-end approach to <a href=\"https:\/\/checkmarx.com\/solutions\/software-supply-chain-security\/\">software supply chain security<\/a>.<\/p>\n\n\n\n<meta name=\"content-section\" content=\"Portfolio_Team_articles\">","protected":false},"excerpt":{"rendered":"<p>Open-source software (OSS) can be a lifesaver. It&#8217;s fast, efficient, and ultimately helpful to push products out quicker. But here&#8217;s the catch: Open source isn&#8217;t just a valuable resource, it&#8217;s also a goldmine for attackers who know exactly where to strike. As OSS adoption skyrockets, understanding how to uncover the hidden threats of malicious code [&hellip;]<\/p>\n","protected":false},"author":118,"featured_media":101577,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[85,84,787,1280,844],"tags":[1257,120],"class_list":["post-101116","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application-security-trends","category-blog","category-white_papers","category-secure-coding-best-practices-for-developers","category-supply-chain-security","tag-malicious-code","tag-open-source"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The AppSec Manager&#039;s Guide to Understanding the Hidden Threats of Malicious Code in Open-Source Software<\/title>\n<meta name=\"description\" content=\"Open source is powerful\u2014but risky. Learn how to detect and prevent malicious OSS attacks like typosquatting and dependency confusion.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The AppSec Manager&#039;s Guide to Understanding the Hidden Threats of Malicious Code in Open-Source Software\" \/>\n<meta property=\"og:description\" content=\"Open source is powerful\u2014but risky. Learn how to detect and prevent malicious OSS attacks like typosquatting and dependency confusion.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/\" \/>\n<meta property=\"og:site_name\" content=\"Checkmarx\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Checkmarx.Source.Code.Analysis\" \/>\n<meta property=\"article:published_time\" content=\"2025-04-11T03:11:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-10T18:37:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/checkmarx.com\/wp-content\/uploads\/2025\/04\/cover_0122.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1279\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Joel Rose\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@checkmarx\" \/>\n<meta name=\"twitter:site\" content=\"@checkmarx\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Joel Rose\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/\"},\"author\":{\"name\":\"Joel Rose\",\"@id\":\"https:\/\/checkmarx.com\/#\/schema\/person\/8cc863d656a4de523dab9b35c0756078\"},\"headline\":\"The AppSec Manager&#8217;s Guide to Understanding the Hidden Threats of Malicious Code in Open-Source Software\",\"datePublished\":\"2025-04-11T03:11:50+00:00\",\"dateModified\":\"2026-04-10T18:37:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/\"},\"wordCount\":990,\"publisher\":{\"@id\":\"https:\/\/checkmarx.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/checkmarx.com\/wp-content\/uploads\/2025\/04\/cover_0122.webp\",\"keywords\":[\"malicious code\",\"open-source\"],\"articleSection\":[\"Application Security Trends &amp; Insights\",\"Blog\",\"Cybersecurity Research &amp; Innovation\",\"Secure Coding Best Practices for Developers\",\"Supply Chain Security\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/\",\"url\":\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/\",\"name\":\"The AppSec Manager's Guide to Understanding the Hidden Threats of Malicious Code in Open-Source Software\",\"isPartOf\":{\"@id\":\"https:\/\/checkmarx.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/checkmarx.com\/blog\/the-appsec-managers-guide-to-understanding-the-hidden-threats-of-malicious-code-in-open-source-software\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/checkmarx.com\/wp-content\/uploads\/2025\/04\/cover_0122.webp\",\"datePublished\":\"2025-04-11T03:11:50+00:00\",\"dateModified\":\"2026-04-10T18:37:12+00:00\",\"description\":\"Open source is powerful\u2014but risky. 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