MalwarePublished 29 Oct 2025

filename-rules (npm) · Malicious Code

Affects filename-rulesSource GCVE Database

Malicious package : remove filename-rules and rotate any secrets on hosts that installed it.

Data as of 29 Oct 2026, 23:04 UTC

Classification

Malicious package

Published to npm · OSV MAL-2025-49003

What to do

Remove filename-rules 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
npmfilename-rules	Affected =3.9.0	Fixed in–

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Description

The npm package 'filename-rules' version 3.9.0 contains malicious code that installs a dependency from a custom domain which executes an information stealer during installation. This malware targets sensitive tokens related to npm, git, and CI/CD environments. Systems with this package installed should be considered fully compromised, and all secrets and keys stored on those systems must be rotated immediately. Removing the package alone may not eliminate all malicious software due to potential full system compromise.

Impact

Complete system compromise is likely if the malicious package is installed, as attackers may gain access to sensitive tokens and credentials used in npm, git, and CI/CD pipelines. This can lead to unauthorized access to source code repositories, deployment pipelines, and other critical infrastructure components. The presence of this malware poses a significant risk to the confidentiality and integrity of development and operational environments.

Defensive guidance

Remove the 'filename-rules' package version 3.9.0 immediately from all affected systems. Rotate all secrets, keys, and tokens that were stored or accessible on compromised machines using a secure, uncompromised environment. Conduct a thorough investigation and remediation of the affected systems, as removing the package alone may not eliminate all malicious components or backdoors.

Summary

The 'filename-rules' npm package version 3.9.0 includes a malicious dependency that runs an info stealer during installation. This info stealer focuses on exfiltrating npm, git, and CI/CD tokens, potentially granting attackers extensive access to development and deployment environments. The compromise is severe enough that affected systems should be treated as fully compromised, requiring immediate secret rotation and comprehensive remediation beyond package removal.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Oct 2026, 23:04 UTC

Technical details

References

Community reviews