--- title: Container Runtime Security in Kubernetes: What Teams... description: Build-time image scanning leaves critical gaps once containers are running in production. Key overlooked areas include running containers as root, overly... canonical: https://daily.dev/posts/container-runtime-security-in-kubernetes-what-teams-overlook-5c69ilqbt twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Container Runtime Security in Kubernetes: What Teams Overlook | daily.dev og:description: Build-time image scanning leaves critical gaps once containers are running in production. Key overlooked areas include running containers as root, overly... og:url: https://daily.dev/posts/container-runtime-security-in-kubernetes-what-teams-overlook-5c69ilqbt og:image: https://api.daily.dev/og/posts/5C69ILqBT.png og:image:alt: Container Runtime Security in Kubernetes: What Teams Overlook og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Container Runtime Security in Kubernetes: What Teams Overlook **[Cloud Native Now](https://daily.dev/sources/cloudnativenow)** · 5 min read · 8 upvotes · 0 comments ## Summary Build-time image scanning leaves critical gaps once containers are running in production. Key overlooked areas include running containers as root, overly permissive RBAC and network policies, lack of real-time threat detection, and configuration drift. Practical mitigations include enforcing non-root execution via Pod Security Standards, default-deny network policies, kernel-level runtime monitoring tools (with 1–2.5% CPU overhead), read-only root filesystems, and continuous scanning beyond deployment time. Recent runC CVEs from 2025 illustrate that the runtime layer is an active attack vector enabling container escape and privilege escalation. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What runC vulnerabilities were found in 2025 that allowed container escape? A SUSE researcher identified three runC vulnerabilities in November 2025 that let an attacker escape a container and operate as root on the host. These flaws highlighted that container runtime security had moved from a theoretical concern to a practical, exploitable risk for Kubernetes teams running containerized workloads in production. _Track emerging runtime CVEs like these on daily.dev to keep container defenses current._ ### What CPU overhead should I expect from Kubernetes runtime security monitoring tools? Well-built kernel-level runtime monitoring tools typically consume only about 1% to 2.5% of CPU capacity. This low overhead makes it feasible to run continuous monitoring for unexpected processes, filesystem writes outside allowed paths, unusual network connections, and privilege-escalating syscalls across large Kubernetes clusters without materially impacting performance. _Compare runtime security tooling overhead on daily.dev before rolling it out cluster-wide._ ### How should I configure Kubernetes network policies to reduce attack surface at runtime? Default-deny all ingress and egress traffic per namespace, then explicitly allowlist only required pod-to-pod and pod-to-service communication, enforced through CNI plugins. This prevents the common misconfiguration where pods can freely communicate with all other pods, which attackers exploit for lateral movement, secret access, and privileged pod creation. _Revisit namespace network policies with guidance surfaced on daily.dev as clusters grow._ ## Similar posts on daily.dev - [What Is Container Runtime Security? A Practical Guide 2026](https://daily.dev/posts/what-is-container-runtime-security-a-practical-guide-2026-9w8xuvgzi) · Orca Security Blog · 1 upvotes · 0 comments - [Containers Are Not Automatically Secure \| Blog](https://daily.dev/posts/containers-are-not-automatically-secure-blog-uywqiabjq) · Programming Digest · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#kubernetes](https://daily.dev/tags/kubernetes), [#containers](https://daily.dev/tags/containers) [View this post on daily.dev](https://daily.dev/posts/container-runtime-security-in-kubernetes-what-teams-overlook-5c69ilqbt) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Container Runtime Security in Kubernetes: What Teams Overlook","url":"https://daily.dev/posts/container-runtime-security-in-kubernetes-what-teams-overlook-5c69ilqbt","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/container-runtime-security-in-kubernetes-what-teams-overlook-5c69ilqbt"},"datePublished":"2026-07-27T20:45:45.003Z","dateModified":"2026-07-28T02:18:21.820Z","description":"Build-time image scanning leaves critical gaps once containers are running in production. 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