MalwarePublished 10 Jul 2026Updated 1 Sep 2026

@uwr/colors (npm) · Malicious Code

Affects @uwr/colorsSource GCVE Database

Malicious package : remove @uwr/colors and rotate any secrets on hosts that installed it.

Data as of 17 Sep 2026, 20:35 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-10179

What to do

Remove @uwr/colors 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@uwr/colors	Affected =1.3.6	Fixed in–

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Description

The npm package @uwr/colors version 1.3.6 contains malicious code in its postinstall script that leaks the installer's machine hostname by performing a DNS lookup to a Burp Suite Collaborator subdomain. This behavior occurs without user consent and appears to be a reconnaissance probe possibly related to dependency confusion attacks. The package claims to provide trivial color constants but has an empty author field and suspicious namespace usage.

Impact

The vulnerability results in the unauthorized exfiltration of the installer's machine hostname during package installation. While this does not directly compromise system integrity or confidentiality of sensitive data, it leaks internal environment information to an attacker-controlled domain, which could aid further targeted attacks or reconnaissance.

Defensive guidance

Users should avoid installing the @uwr/colors package version 1.3.6 and verify the authenticity of packages before installation, especially those from untrusted or internal namespaces. Monitor for updates or advisories from the package repository or security vendors regarding this package.

Summary

The @uwr/colors npm package version 1.3.6 includes a postinstall script that reads the local machine's hostname using os.hostname() and then performs a DNS lookup to a subdomain of oastify.com, a domain used by Burp Suite Collaborator for out-of-band data exfiltration. This action leaks the hostname to an external server during installation without user consent. The package's advertised functionality is minimal, and its metadata suggests it may be a malicious or reconnaissance package targeting internal namespaces via dependency confusion techniques.

References

Community reviews

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What to do

Affected software

Description

AI analysisMachine-generated, updated 17 Sep 2026, 20:35 UTC

Technical details

References

Community reviews