Malicious Code Injection in certain_hippopotamus_0xrequest Package

Summary

11/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-100313: Malicious code in certain_hippopotamus_0xrequest (npm). Affected versions are not published. No fix is published. How to fix ↓

Free scan

Check if this vulnerability affects your application

Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.

Check my app free

No signup required · Results in about 60 seconds

Upload your dependency manifest or SBOM

Drag & drop your file here or

Java Javascript PHP Python Go Rust Ruby Dart C/C++ Elixir CycloneDX SPDX

Upload a supported dependency manifest or SBOM. No installation or source-code access required.

See supported files and SBOM formats
SBOM sbom.json · bom.json · bom.xml · *.spdx.json · *.cdx.json · *.cdx.xml
Java pom.xml · gradle.lockfile · buildscript-gradle.lockfile
Javascript package-lock.json · yarn.lock · pnpm-lock.yaml
PHP composer.lock
Python poetry.lock · requirements.txt · Pipfile.lock
Go go.mod
Rust Cargo.lock
Ruby Gemfile.lock
Dart pubspec.lock
C/C++ conan.lock
Elixir mix.lock
Enter your work email to receive your report link.

Verify your email to view the full report and start 30 days of continuous monitoring. No credit card required.

Sponsored Devnack Penetration testing for web, API and mobile Manual testing by engineers who build software, not an auditor's checklist. Trusted by teams at Swift and Google Talk to Devnack

Background

The certain_hippopotamus_0xrequest package is part of the npm ecosystem, typically used for various JavaScript functionalities. This package has been identified as part of a malicious campaign that aims to inflate developer reputation scores through the creation and publication of derivative packages. The malicious nature of this package lies in its ability to modify critical files and republish variants, leading to potential security risks for developers and users alike.

Vulnerability Detail

The vulnerability originates from a malicious payload embedded within the certain_hippopotamus_0xrequest package. This payload modifies the package.json file by removing private flags, altering version numbers, and generating random package names. The intent is to flood the npm registry with these variants, which can lead to reputation inflation for the attackers and potential security risks for users who unknowingly install these compromised packages. The continuous republishing of these variants can pollute the npm ecosystem, making it difficult for developers to identify legitimate packages.

How To Fix

This package is malicious. Remove it and rotate any credentials it could have accessed.

npm uninstall certain_hippopotamus_0xrequest

If it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

Workaround

As a temporary workaround, you can avoid using the certain_hippopotamus_0xrequest package altogether and look for alternative packages that provide similar functionality without the associated risks. Additionally, regularly audit your package-lock.json file to monitor for any suspicious packages.

Conclusion

The certain_hippopotamus_0xrequest package poses a significant security risk due to its malicious code that modifies essential files and floods the npm registry. It is crucial for developers to be vigilant and remove this package from their projects, ensuring they replace it with secure alternatives. Utilizing tools like Vulert can help in monitoring for such vulnerabilities effectively.

See every vulnerability recorded for certain_hippopotamus_0xrequest →

Share this vulnerability

FAQ

It is an npm package that has been identified as part of a malicious campaign to inflate developer reputation scores through the creation of derivative packages.

The vulnerability can lead to the installation of malicious code that modifies your package.json file and floods the npm registry, posing security risks.

You should uninstall the certain_hippopotamus_0xrequest package immediately and check for any dependencies that may rely on it.

Yes, you can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities using just your package-lock.json file.

You can use the Vulert playground at Vulert Scanner to check if your application is affected without requiring any signup.

How To Fix

This package is malicious. Remove it and rotate any credentials it could have accessed.

npm uninstall certain_hippopotamus_0xrequest

If it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

Subscribe to Vulert on Telegram
Daily digest of new CVEs, critical and high severity, affected packages and fixes — plus a weekly roundup.
Join the channel →
Help improve this record
Report an issue or send feedback