# MAL-2026-12627: Malicious code in claims-jira-service (npm)


- **Type:** Malicious package
- **Package:** `claims-jira-service` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12627?

MAL-2026-12627 is a malicious package in claims-jira-service, published on 5 Aug 2026. 

### Official description

On require('claims-jira-service'), index.js loads _ext.js which downloads a platform-specific executable from author-controlled hosts assembled at runtime by Array.join string-splitting (oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev) with a DNS TXT record fallback under *.dl.wel1.ru. The fetched bytes are written to a temp directory under disguised names (.cache_<hex>, dotnet_diag_<hex>.exe), chmod 0755, and spawned detached via /bin/sh -c or cmd. A stamp file with a benign name (.analytics_state) is used to throttle re-execution. Hostnames and payload paths are split across string arrays to defeat static analysis, and DNS-TXT chunking is used as a covert transport channel.

## What should I do about MAL-2026-12627?

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-2026-12627 is a malicious package: claims-jira-service (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-2026-12627/ (Markdown: https://insights.sbomify.com/MAL-2026-12627/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12627

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12627/
Summaries are generated and may contain mistakes; the official description above is the record.