Runtime Security Tools

Falco, tracee, etc. The 2026 tools.

Falco

Falco is the CNCF-graduated default for Kubernetes runtime detection. Rules-based, eBPF or kernel-module backed, community rule library; the canonical starting point for runtime security in Kubernetes.

• CNCF-graduated. Mature default per cluster; rules-based detection at the kernel level via eBPF or kernel modules.
• Standard for K8s runtime detection. Canonical pick per cluster; detects unexpected exec, sensitive file access, unusual network connections.
• Rule library is the value. Community-maintained ruleset per cluster covers known attack patterns; custom rules for organisation-specific threats.
• Quarterly rule-tuning cadence. Rule-noise audit per quarter catches alert fatigue before it produces ignored detections.

Tracee (Aqua Security)

Tracee is the modern eBPF-based alternative. Lower overhead than Falco's kernel-module mode, behavioural detection alongside rules, open-source with a paid tier for management plane and SOC integration.

• eBPF-based, lower overhead. Modern alternative per cluster; lower overhead than Falco's kernel-module mode.
• Behavioural plus rule-based. Both-modes coverage per detection; anomaly detection on container behaviour alongside rule matching.
• Open-source with paid tier. OSS-vs-paid choice per org; open-source covers detection, paid adds management plane and SOC integrations.
• Named rollout owner per cluster. Responsible team per cluster supports operational reviews and tuning cycles.

Commercial alternatives

Commercial vendors offer managed runtime security. Higher cost, lower operational burden, often bundled with broader container security stacks. The right answer when the team lacks dedicated SecOps capacity.

• Vendor options. Aqua, Sysdig, CrowdStrike, SentinelOne per org; managed runtime security with SOC integration.
• Higher cost, lower operational burden. Cost-vs-burden trade per org; suitable for organisations without dedicated security operations.
• Often bundled with broader stacks. Vulnerability scan and admission control bundled per vendor; single vendor for full container security stack.
• Proof-of-value per vendor. 30-90 day POC per vendor catches integration gaps before purchase.

Integration patterns

Three integration patterns: SIEM correlation, SOAR auto-response, on-call notification by severity. All three together produce useful detection; any alone leaves gaps.

• Detection events to SIEM. Splunk, Datadog Security, Elastic SIEM feed per detection; centralised correlation with other security signals.
• Auto-response via SOAR. High-confidence containment trigger per detection; pod isolation, image quarantine, network policy update.
• Notification to security on-call. Severity-tier routing per detection; pages for critical, channels for medium, dashboard for low.
• Audit log per detection. Captured action history per detection supports postmortem reconstruction and compliance evidence.

How to decide

Pick by team capability and budget. OSS for teams with security expertise; vendor-managed without dedicated SecOps; multi-tier deployment at mature security organisations.

• OSS for teams with security expertise. Falco or Tracee pick per org; modest budget, operational burden bounded by available expertise.
• Vendor-managed without dedicated SecOps. Managed-tier pick per org; higher cost, significantly lower operational time investment.
• Multi-tier at mature orgs. Falco-for-basic plus vendor-for-advanced pattern per org; common at mature security organisations with deep coverage requirements.
• Documented rationale per decision. Named "why this pick" doc per org supports later reviews and renewal conversations.