MAL-2026-12627 Malicious code in claims-jira-service (npm)
Malicious package
Published
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)
- Package
- claims-jira-service
- Registry
- npm
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.