MalwarePublished 28 Sep 2026

simple-date-formatter-new-12 (npm) · Malicious Code

Affects simple-date-formatter-new-12Source GCVE Database

Malicious package : remove simple-date-formatter-new-12 and rotate any secrets on hosts that installed it.

Data as of 29 Sep 2026, 04:59 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-17229

What to do

Remove simple-date-formatter-new-12 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
npmsimple-date-formatter-new-12	Affected =1.0.0	Fixed in–

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Description

The npm package simple-date-formatter-new-12@1.0.0 contains malicious code in its postinstall script that executes automatically during installation. This script fetches data from an internal Baidu host and exfiltrates the response to an attacker-controlled server. The package's stated functionality is a simple date formatter, but the embedded network activity is unrelated and indicative of a dependency confusion or typosquatting attack to probe internal network access and leak data.

Impact

Installation of this package results in execution of malicious code that performs server-side request forgery (SSRF) to an internal Baidu host and exfiltrates the response data to an attacker-controlled server. This can lead to leakage of internal network information and potentially sensitive data accessible from the installer's network environment. The malicious behavior is hidden in a package that appears to provide benign date formatting functionality, increasing the risk of inadvertent installation in development or production environments.

Defensive guidance

Users should avoid installing the simple-date-formatter-new-12 package version 1.0.0. Review and remove this package if already installed. Employ strict package source verification and dependency auditing to prevent installation of typosquatting or malicious packages. Monitor package registries and advisories for updates or removals related to this package.

Summary

The npm package simple-date-formatter-new-12 version 1.0.0 includes a postinstall lifecycle script that runs automatically on npm install. This script uses curl to request an internal Baidu URL, writes the response to a temporary file, and then sends the file contents to an attacker-controlled interactsh collector domain. The package's advertised functionality is a trivial date-formatting wrapper, but the embedded SSRF probe and outbound data exfiltration are unrelated to its purpose. The package's naming pattern, lack of author metadata, and exfiltration behavior suggest it is a malicious dependency confusion or typosquatting probe designed to detect installation within target organizations and leak internal network responses.

References

npmjs.com/package/simple-date-formatter-new-12/v/1.0.0 (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Sep 2026, 04:59 UTC

Technical details

References

Community reviews