# MAL-2026-12486: Malicious code in travel-core-typings-reducers (npm)


- **Type:** Malicious package
- **Package:** `travel-core-typings-reducers` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-f4c8-g3cf-mgc9

## What is MAL-2026-12486?

MAL-2026-12486 is a malicious package in travel-core-typings-reducers, published on 5 Aug 2026. 

### Official description

On require() of the package, index.js loads _ext.js which downloads a platform-specific binary from runtime-assembled Cloudflare workers.dev hostnames (oob-worker.cf99-9b3.workers.dev, cf100-416, cf101-adf, cf103-070) with a DNS-TXT covert-channel fallback against subdomains of dl.well1.site (tin/ldr/win.dl.well1.site) that reassembles base64 chunks into executable bytes. The fetched payload is written to /var/tmp or %TEMP% under disguised names (.cache_<rand> on Unix, dotnet_diag_<rand>.exe on Windows), chmod +x'd, and spawned detached via spawn("/bin/sh",["-c",fp+" &"],{detached:true}) or spawn("cmd",...). C2 hostnames are assembled at runtime via ["oob-work","er.cf103-07","0.workers.","dev"].join("") to defeat static string search. The package presents itself as a base framework typings module and ships an unreferenced lib/telemetry.js plus DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK opt-out env vars as cover; the DNS-TXT path carries an inline comment describing it as chunked transfer for environments blocking HTTPS.

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-2026-12486?

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-2026-12486 is a malicious package: travel-core-typings-reducers (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-2026-12486/ (Markdown: https://insights.sbomify.com/MAL-2026-12486/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12486

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12486/
Summaries are generated and may contain mistakes; the official description above is the record.