MalwarePublished 29 Jun 2026Updated 1 Sep 2026

clx-cookieparser (npm) · Malicious Code

Affects clx-cookieparserSource GCVE Database

Malicious package : remove clx-cookieparser and rotate any secrets on hosts that installed it.

Data as of 12 Sep 2026, 21:31 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-6661

What to do

Remove clx-cookieparser 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
npmclx-cookieparser	Affected–	Fixed in–

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Description

The 'clx-cookieparser' npm package is a malicious lookalike of the legitimate 'cookie-parser' middleware. It copies the original code but falsely claims a repository affiliation that does not exist, causing potential confusion for developers. Although the package itself does not perform network I/O or contain obfuscated or credential-stealing code, its installation is considered highly dangerous as it may lead to full system compromise. Immediate removal and secret/key rotation are advised if installed.

Impact

Installation of 'clx-cookieparser' can lead to full system compromise. Any secrets or keys stored on the affected machine should be considered exposed and must be rotated immediately. Removing the package alone may not fully remediate the compromise due to potential persistence of other malicious components.

Defensive guidance

Remove the 'clx-cookieparser' package immediately if installed. Rotate all secrets and keys from a secure, uncompromised environment. Conduct a thorough security assessment of the affected system to identify and remediate any additional malicious artifacts.

Summary

The 'clx-cookieparser' package on npm is a malicious clone of the Express 'cookie-parser' middleware, repackaged under a different name with a fake repository attribution to mislead developers. The code reimplements cookie-parser functionality without network activity or obfuscation, but the package is flagged as malicious by security sources. Installing this package can result in full compromise of the host system, necessitating urgent remediation actions.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Sep 2026, 21:31 UTC

Technical details

References

Community reviews