MalwarePublished 10 Jul 2026Updated 24 Sep 2026

rollup-packages-polyfill-core (npm) · Malicious Code

Affects rollup-packages-polyfill-coreSource GCVE Database

Malicious package : remove rollup-packages-polyfill-core and rotate any secrets on hosts that installed it.

Data as of 26 Oct 2026, 15:56 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-10160

What to do

Remove rollup-packages-polyfill-core 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
npmrollup-packages-polyfill-core	Affected 0.0.0 – 0.14.1 14 affected builds	Fixed in–

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Description

The npm package 'rollup-packages-polyfill-core' contains malicious code that dynamically installs and executes a secondary malicious module named 'vectormark'. This package is a typosquat of the legitimate 'rollup-plugin-polyfill-node' and hides its malicious behavior by encoding commands and module names in base64. Installing or running this package can lead to full system compromise, requiring immediate secret and key rotation and package removal.

Impact

Any system with this package installed or running should be considered fully compromised. The attacker gains arbitrary code execution capabilities, potentially leading to complete system takeover. All secrets and keys on the affected system should be considered exposed and must be rotated immediately from a different, trusted system. Removing the package alone may not fully remediate the compromise due to potential persistence mechanisms.

Defensive guidance

Remove the 'rollup-packages-polyfill-core' package immediately. Rotate all secrets and keys stored on the affected system from a separate, secure environment. Because the system may be fully compromised, consider rebuilding the system or performing a thorough forensic analysis to ensure all malicious artifacts are removed.

Summary

The 'rollup-packages-polyfill-core' npm package, specifically versions 0.13.7 and 0.13.8, contains malicious code that, upon requiring its main entry point, decodes and executes a base64-encoded shell command to install an unpinned secondary malicious package 'vectormark' without saving it to the consumer's lockfile. It then dynamically requires and executes this second-stage package, enabling arbitrary code execution. The package name is a typosquat of the legitimate 'rollup-plugin-polyfill-node', and the malicious commands are obfuscated using base64 encoding to evade static analysis.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Sep 2026, 18:47 UTC

Technical details

References

Community reviews