What is trivy-offline-vulnerability-scanning?

A guide to using Trivy to scan dependency files for known security vulnerabilities without connecting to the internet. Trivy is a security scanner, and offline mode uses a database already downloaded.

Use it to scan files such as package-lock.json and produce machine-readable JSON vulnerability results.

It helps find high- and critical-severity issues when database updates or network access are unavailable.

trivy-offline-vulnerability-scanning — Skill for Claude Code and Codex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add cxcscmu/SkillLearnBench --skill trivy-offline-vulnerability-scanning

Clone the repo

git clone --depth 1 https://github.com/cxcscmu/SkillLearnBench

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/cxcscmu/skilllearnbench/trivy-offline-vulnerability-scanning/github.svg)](https://agentmods.dev/skills/cxcscmu/skilllearnbench/trivy-offline-vulnerability-scanning)

Your own site

<a href="https://agentmods.dev/skills/cxcscmu/skilllearnbench/trivy-offline-vulnerability-scanning"><img src="https://agentmods.dev/badge/skills/cxcscmu/skilllearnbench/trivy-offline-vulnerability-scanning/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/cxcscmu/skilllearnbench/trivy-offline-vulnerability-scanning"><img src="https://agentmods.dev/badge/skills/cxcscmu/skilllearnbench/trivy-offline-vulnerability-scanning.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 404 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00025	$0.00404
Opus 5	$0.00013	$0.00202
Sonnet 5	$0.00005	$0.00081
Haiku 4.5	$0.00003	$0.00040

Measured 6d ago against content hash d663f95aec17, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

trivy-offline-vulnerability-scanning scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/b1-one-shot-claude-opus-4-6/dependency-vulnerability-check/trivy-offline-vulnerability-scanning/SKILL.md · 44 lines

What it actually says

Trivy Offline Vulnerability Scanning

Overview

Trivy is a comprehensive security scanner that can detect vulnerabilities in OS packages and application dependencies. In offline mode, it uses a pre-downloaded vulnerability database.

Key Commands

Scan a package-lock.json file (offline, JSON output)

trivy fs --skip-db-update --skip-java-db-update \
  --format json \
  --scanners vuln \
  --pkg-types library \
  --severity HIGH,CRITICAL \
  /path/to/package-lock.json

Important Flags

--skip-db-update: Use the already-downloaded DB (offline mode)
--skip-java-db-update: Skip Java DB update for non-Java projects
--format json: Machine-readable output for downstream processing
--severity HIGH,CRITICAL: Filter by severity level
--scanners vuln: Only scan for vulnerabilities (skip misconfig, secret, etc.)
--pkg-types library: Scan application libraries only

Output Structure (JSON)

The JSON output contains a Results array. Each result has:

Target: the scanned file
Vulnerabilities: array of vulnerability objects with fields:
- PkgName: package name
- InstalledVersion: installed version
- VulnerabilityID: CVE ID (e.g., CVE-2023-1234)
- Severity: HIGH, CRITICAL, etc.
- CVSS: object with scoring from multiple sources (nvd, ghsa, redhat)
- FixedVersion: version that fixes the vulnerability (may be empty)
- Title: short vulnerability title
- PrimaryURL: reference URL
- Description: longer description (use if Title is empty)

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

6d ago First seen · 44 lines · 25 tokens per session scan A d663f95aec17

Subscribe to this mod's changes

trivy-offline-vulnerability-scanning is a skill published in the GitHub repository cxcscmu/SkillLearnBench (83 stars, last pushed 2mo ago), licensed MIT. It adds 25 tokens to every session and 404 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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