# MAL-2026-10587: Malicious code in dayjscore (npm)


- **Type:** Malicious package
- **Package:** `dayjscore` (npm)
- **Published:** 14 Jul 2026

## What is MAL-2026-10587?

MAL-2026-10587 is a malicious package in dayjscore, published on 14 Jul 2026. 

### Official description

The package's package.json declares scripts.postinstall = "node.init.js", causing.init.js to run automatically on npm install. The script harvests a hardcoded list of roughly 60 credential-shaped environment variables (including NPM_TOKEN, GITHUB_TOKEN, AWS_ACCESS_KEY_ID/AWS_SECRET_ACCESS_KEY, STRIPE_*, DB_PASSWORD, and other cloud/provider tokens), reads files under the installer's home directory (~/.npmrc, ~/.env*, ~/config.json, ~/credentials.json), and enumerates ~/.config/* for filenames containing token/cred/secret. It additionally collects host identifiers (os.hostname(), os.platform(), process.cwd(), process.pid, timestamp) and POSTs the resulting JSON via https.request to a hardcoded webhook.cool endpoint (tender-deer-80). The package name mimics the popular dayjs library.

## What should I do about MAL-2026-10587?

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-2026-10587 is a malicious package: dayjscore (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-2026-10587/ (Markdown: https://insights.sbomify.com/MAL-2026-10587/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-10587

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-10587/
Summaries are generated and may contain mistakes; the official description above is the record.