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npm · Malicious package advisory

Malware

mbo-letters-cl

MAL-2026-611

Malicious code in mbo-letters-cl (npm)

Details


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## Source: amazon-inspector (d367723532d1a3f90f88a1d23230230dafb47b5f26a68af29aafda36084f5417)
The package mbo-letters-cl was found to contain malicious code.

## Source: ossf-package-analysis (5f9cd1b0fbc8ed1c3c4975adcaea6990c6ac35de212e800a257b2a5a6164f281)
The OpenSSF Package Analysis project identified 'mbo-letters-cl' @ 1.9.992 (npm) as malicious.

It is considered malicious because:

- The package communicates with a domain associated with malicious activity.

- The package executes one or more commands associated with malicious behavior.

Compromised versions (2)

  • 1.9.992
  • 1.9.99

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.