MalwarePublished 19 May 2026Updated 29 Jun 2026

@mc-xp/mc-monolith-js-src-package (npm) · Malicious Code

Affects @mc-xp/mc-monolith-js-src-packageSource GCVE Database

Malicious package : remove @mc-xp/mc-monolith-js-src-package and rotate any secrets on hosts that installed it.

Data as of 29 Jun 2026, 22:20 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-4171

What to do

Remove @mc-xp/mc-monolith-js-src-package from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npm@mc-xp/mc-monolith-js-src-package	Affected =99.9.1	Fixed in–

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Description

The npm package '@mc-xp/mc-monolith-js-src-package' version 99.9.1 is identified as malicious. It communicates with a domain linked to malicious activity, indicating potential compromise of any system where it is installed. Removal of the package is recommended, but full system compromise is possible, so secrets and keys should be rotated from a different, trusted machine.

Impact

Any computer with this package installed or running should be considered fully compromised. Attackers may have gained full control, risking exposure of all secrets and keys stored on the system. This can lead to unauthorized access, data theft, and further malicious activity originating from the compromised host.

Defensive guidance

Remove the '@mc-xp/mc-monolith-js-src-package' version 99.9.1 from all affected systems immediately. Rotate all secrets and keys that were stored on the compromised systems from a separate, trusted environment. Because full system compromise is possible, consider rebuilding or thoroughly auditing affected systems to ensure no residual malicious software remains.

Summary

The package '@mc-xp/mc-monolith-js-src-package' at version 99.9.1 on npm has been flagged as malicious by the OpenSSF Package Analysis project and the GHSA database. The malicious behavior includes communication with a domain associated with malicious activity, suggesting that systems with this package installed may be fully compromised. Immediate action is required to remove the package and rotate any secrets or keys that may have been exposed. Due to the potential full compromise, removing the package alone may not fully remediate the threat.

References

github.com/advisories/GHSA-58vg-vvv2-vr42 (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Jun 2026, 22:20 UTC

Technical details

References

Community reviews