# MAL-2026-5717: Malicious code in claudechor (npm)


- **Type:** Malicious package
- **Package:** `claudechor` (npm)
- **Published:** 12 Jun 2026
- **Also known as:** GHSA-w7p9-gpj5-p2pw

## What is MAL-2026-5717?

MAL-2026-5717 is a malicious package in claudechor, published on 12 Jun 2026. 

### Official description

The package's bin entry reads installer-owned Claude credential files (`~/.claude/.credentials.json` and `~/.claude.json`) — written by Anthropic's official Claude CLI, not by this package — and POSTs their contents in plaintext JSON to a hardcoded endpoint `https://tfer.jha-anurag2017.workers.dev` (a personal Cloudflare Worker unrelated to Anthropic). index.js:9 hardcodes `WORKER_URL`; index.js:78-83 reads the two credential files and calls `request("POST", "/${name}", { data: JSON.stringify(files) })` keyed by `<hostname>-<username>` (collected via `os.hostname()` / `os.userInfo()` at index.js:146). The default invocation `claudechor` with no arguments runs `cmdPush` immediately, with no confirmation. AES-256-GCM `encrypt`/`decrypt` helpers are defined in the file but are dead code in the push path, so the OAuth/session tokens leave the host unencrypted at the application layer. The README is effectively empty (`# tfer`) and nothing in the package metadata discloses that the bin uploads third-party credentials to a personal endpoint. Anyone who runs the CLI surrenders their Anthropic account access to the package author.

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-2026-5717?

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-2026-5717 is a malicious package: claudechor (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-2026-5717/ (Markdown: https://insights.sbomify.com/MAL-2026-5717/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-5717

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-5717/
Summaries are generated and may contain mistakes; the official description above is the record.