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Security: nunet/appliance

Security

SECURITY.md

Dependency Vulnerability Management Policy

Overview

This project adopts a controlled and risk-based approach to managing third-party dependency vulnerabilities.

The goal is to:

  • Maintain build stability and reproducibility
  • Ensure timely remediation of relevant security risks
  • Avoid disruptions caused by external advisory database changes

Vulnerability Classification

Vulnerabilities are handled according to their severity:

Severity Description Action
CRITICAL High impact, exploitable remotely Blocks pipeline
HIGH Significant risk Must be fixed within SLA
MEDIUM Moderate risk Tracked and prioritized
LOW Minimal impact Logged for awareness

CI/CD Enforcement Rules

  1. Pull Requests / Standard Pipelines
  • Only CRITICAL vulnerabilities block the pipeline
  • HIGH and below:
    • Do not block builds
    • Are reported in logs
  1. Scheduled Security Audit
  • A full security audit runs on a scheduled basis (daily or weekly):
    • Uses strict mode (--strict)
    • Fails on any known vulnerability
    • Results must be reviewed and acted upon

Remediation SLAs

Severity Time to Fix
CRITICAL 24–48 hours
HIGH Up to 7 days
MEDIUM Up to 30 days
LOW Best effort

Exceptions (Allowlisting)

Vulnerabilities may be temporarily ignored if:

  • No fix is available, or
  • The vulnerability does not affect the runtime context

Requirements:

  • Must include justification
  • Must include expiration or review date

Example:

pip-audit --ignore-vuln CVE-XXXX-YYYY

Runtime Context Consideration

Not all vulnerabilities are equally relevant.

Examples:

  • Dev-only tools (e.g., build systems, bundlers)
  • Test dependencies

These may be deprioritized if:

  • Not included in production artifacts
  • Not exposed in runtime environments

Dependency Management

  • Dependencies should be version-pinned
  • Regular updates must be performed:
    • Weekly or biweekly recommended
  • Automated tools (e.g., Renovate, Dependabot) are encouraged

Responsibilities

  • Developers:

    • Review vulnerabilities affecting their changes
    • Address CRITICAL issues immediately
  • Maintainers:

    • Review scheduled audit failures
    • Ensure SLA compliance

Notes

  • Security tooling relies on external advisory databases that change over time
  • Pipeline stability must not depend on real-time external updates
  • Security must be actively managed, not passively enforced

There aren't any published security advisories