What is container security scanning?

Container security scanning inspects a container image for known vulnerabilities (CVEs), misconfigured settings, and embedded secrets before the image is deployed. Scanners check every package layer in the image, including transitive dependencies pulled in by direct dependencies.

Do I need container security if I already have a CSPM tool?

CSPM tools audit cloud account and service configurations but do not inspect container images or monitor running container behavior. You need dedicated container security or a CWPP/CNAPP product to cover image vulnerabilities and runtime threats inside Kubernetes clusters.

What is Kubernetes Security Posture Management (KSPM)?

KSPM continuously checks Kubernetes cluster configuration against security benchmarks such as CIS Kubernetes. It flags issues like overly permissive RBAC roles, missing network policies, or privileged pod settings that could be exploited by an attacker.

What is the difference between agentless and agent-based container security?

Agentless tools scan images and cluster APIs without installing software inside each node or pod, which reduces setup effort. Agent-based tools, often using eBPF, run on each node to monitor system calls and network activity in real time, providing deeper runtime visibility.

What is Container Security?

Container security is the practice of protecting containerized workloads, including Docker images, Kubernetes clusters, and the pipelines that build and deploy them. It covers vulnerability scanning, runtime threat detection, policy enforcement, and configuration hardening across the full container lifecycle.

What it does

Container security tools protect workloads that run inside containers, from the moment an image is built to the moment a container is stopped. Core capabilities include:

Image scanning: checks container images for known CVEs, outdated packages, and embedded secrets before deployment.
Software Bill of Materials (SBOM): catalogs every package inside an image so teams know exactly what they are running.
Runtime monitoring: watches running containers for unexpected processes, network connections, or file changes, often using eBPF probes.
Kubernetes policy enforcement: blocks or mutates workloads that violate rules, such as containers running as root or missing resource limits.
Kubernetes Security Posture Management (KSPM): audits cluster configuration against benchmarks like CIS Kubernetes.
Ingress control: routes and filters traffic entering a cluster, enforcing TLS and rate limits at the edge.

Why teams buy it

Containers change faster than traditional VMs. A single base image can be pulled thousands of times before a CVE is patched. Teams buy container security tools to catch vulnerable images before they reach production, to detect attacks at runtime without installing heavyweight agents, and to enforce consistent policy across multi-cloud Kubernetes fleets. Compliance frameworks such as PCI DSS and SOC 2 increasingly require evidence of image scanning and runtime controls.

What to look for

Scan depth: does the scanner resolve transitive dependencies, not just direct ones?

What is Container Security?

What it does

Why teams buy it

What to look for

Common confusions

Container Security tools

Frequently asked questions