offensive-dependency-confusion skillA
offensive-dependency-confusion is agent-read markdown (skill) from snailsploit/claude-red: Deep-dive offensive methodology for dependency confusion and namespace attacks across all major package ecosystems. Covers npm scope confusion exploiting the gap between public and private scoped packages and .npmrc misconfigurations where registry mappings fail to pin internal scopes exclusively. Addresses PyPI namespace attacks through --extra-index-url resolution ordering, NuGet feed priority exploitation when multiple package sources are configured without clear directives, Maven and Gradle .
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Offensive Dependency Confusion and Namespace Attacks Dependency confusion exploits a fundamental design tension in package managers: the need to resolve packages from multiple sources. When an organization maintains internal packages alongside public dependencies, the resolution logic becomes an attack surface. You exploit the gap between how developers intend packages to resolve and how package managers actually resolve them. Alex Birsan's 2021 research demonstrated that this class of attack affected Apple, Microsoft, PayPal, Shopify, Netflix, Yelp, Tesla, and Uber, among others. The root cause -- preferring a higher-versioned public package over a lower-versioned private one -- remains exploitable wherever registry configuration is incomplete. This skill provides ecosystem-specific exploitation techniques, safe PoC methodology, and comprehensive reconnaissance approaches for discovering internal package names during authorized engagements. ## Quick Workflow 1. Perform reconnaissance to discover internal/private package names used by the target. 2. Identify the target's package ecosystems and registry configuration. …
Read the whole file at its exact version.
How to install
mdr add snailsploit/claude-red/offensive-dependency-confusion@git:20260825.900e4c2mdr add snailsploit/claude-red/offensive-dependency-confusion@sha256:e394e3eb2467b93dPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_cfzzqecym36aj5cz)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260825.900e4c2 latest | 2026-08-25 | 900e4c2 | 23,800 B | A | view · diff |
| git:20260825.1885f44 | 2026-08-25 | 1885f44 | 24,639 B | A | view · diff |
| git:20260825.8cffe5d | 2026-08-25 | 8cffe5d | 27,147 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (23800 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
snailsploit/claude-red · 6,831 stars · license MIT · pushed 2026-09-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cfzzqecym36aj5cz GET https://markdownregistry.com/api/v1/resolve?ref=snailsploit/claude-red/offensive-dependency-confusion GET https://markdownregistry.com/api/v1/blob/e394e3eb2467b93d8cf65c3db1a2bc01d27c53c6d2ea704b18f6ef10bc3fcb8b
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