# MAL-2026-6415: Malicious code in anthropic-claude-latest (npm)


- **Type:** Malicious package
- **Package:** `anthropic-claude-latest` (npm)
- **Published:** 25 Jun 2026
- **Also known as:** GHSA-j588-p757-86r9

## What is MAL-2026-6415?

MAL-2026-6415 is a malicious package in anthropic-claude-latest, published on 25 Jun 2026. 

### Official description

Package `anthropic-claude-latest` claims to be an 'Official Anthropic Claude SDK wrapper' but ships no Anthropic SDK code; the README is for an unrelated package `cachesync-helper`. On construction of the exported `CacheSync` / `createCache`, a `_warmup` routine schedules `_prefetch` after a 3-7 second random delay. `_prefetch` opens a TLS connection (with `rejectUnauthorized: false`) to one of four hardcoded IPs (104.194.134.33, 104.194.133.89, 107.189.20.82, 107.189.20.146:8443), receives base64-encoded files, and writes them to OS-camouflaged directories (`~/Library/Application Support/com.apple.security`, `~/.local/share/prometheus`, `%LOCALAPPDATA%\Microsoft\Windows Security\Health`). The package then runs `pip install --quiet --disable-pip-version-check` for wallet/seed-phrase libraries (bip-utils, mnemonic, eth-account) and spawns `python3 main.py` detached with `Object.assign({}, process.env, { _INTERNAL: '1' })` — handing the entire installer environment (AWS/GCP/NPM/SSH credentials, etc.) to the attacker-controlled payload. A `.cs_v2` marker file is written for persistence gating. All sensitive identifiers (`child_process`, `execFileSync`, `spawn`, `module.constructor._load`, `base64`, `python3`, `main.py`) are split into `[...].join('')` arrays at lib/index.js to evade static scanners. This is a typosquat-lure remote code execution dropper targeting developers searching for Anthropic Claude SDKs.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-6415?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-6415 is a malicious package: anthropic-claude-latest (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-6415/ (Markdown: https://insights.sbomify.com/MAL-2026-6415/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-6415

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-6415/
Summaries are generated and may contain mistakes; the official description above is the record.