MalwarePublished 16 Mar 2026Updated 30 Apr 2026

transform-regexp-constructors (npm) · Malicious Code

Affects transform-regexp-constructorsSource GCVE Database

Malicious package : remove transform-regexp-constructors and rotate any secrets on hosts that installed it.

Data as of 27 Oct 2026, 00:33 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-3125

What to do

Remove transform-regexp-constructors 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
npmtransform-regexp-constructors	Affected >=0.4.3 =0.4.3	Fixed in–

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Description

The npm package 'transform-regexp-constructors' is part of the PhantomRaven supply chain attack campaign. It uses a Remote Dynamic Dependency technique to fetch and execute a malicious payload during installation. This payload harvests developer emails, CI/CD tokens, and fingerprints the host system, exfiltrating data to an attacker-controlled server. Developers and CI/CD systems that installed this package should consider their environments compromised and rotate all accessible secrets and credentials immediately.

Impact

Any developer or CI/CD environment that installed the affected package is compromised. Sensitive information including developer emails, CI/CD tokens, and environment credentials may have been exfiltrated. This can lead to unauthorized access to development and deployment pipelines, potentially enabling further compromise of software supply chains and internal infrastructure.

Defensive guidance

Immediate rotation of all secrets, tokens, and credentials accessible from the compromised environment is required, using a separate, unaffected machine. Avoid using the affected package versions (>=0.4.3). Since this is a malicious package, removal and replacement with trusted dependencies is necessary. Monitor for any unauthorized access resulting from leaked credentials.

Summary

The 'transform-regexp-constructors' npm package was weaponized in the PhantomRaven supply chain attack campaign (Wave 3). The package.json includes a URL-based dependency pointing to an attacker-controlled C2 server (package.storeartifacts.com). During 'npm install', a malicious tarball is fetched and its preinstall hook executes a 259-line payload that collects sensitive information such as developer emails from configuration files, CI/CD tokens from multiple platforms (GitHub Actions, GitLab CI, Jenkins, CircleCI), and system fingerprints. This data is exfiltrated via HTTP GET, POST, and WebSocket requests to the attacker's server without visible output. The campaign was disclosed by Koi Security starting October 2025 and continued through early 2026. The package version 0.4.3 and later are affected.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 27 Oct 2026, 00:33 UTC

Technical details

References

Community reviews