Critical Malicious Code Vulnerability in flagstealerfinal Package

flagstealerfinal Updated 19 Dec 2025

Summary

19/12/2025
CRITICAL
No i
Critical
Not published

MAL-2025-192629: Malicious code in flagstealerfinal (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 MarkAI Find prospects already talking about the problem you solve AI watches the communities your customers use to find qualified prospects, then alerts you when a conversation is worth joining. See MarkAI

Background

The flagstealerfinal package is an npm library that is intended for use in JavaScript applications. It is designed to facilitate certain functionalities within these applications. However, it has been identified as containing malicious code, which poses a significant security risk to any system where it is installed. This vulnerability allows attackers to gain unauthorized access to sensitive information stored on the affected systems.

Vulnerability Detail

The vulnerability originates from the inclusion of malicious code within the flagstealerfinal package. This code can compromise the security of any computer that has the package installed, allowing attackers to access secrets and keys stored on the system. The ramifications of this vulnerability are severe, as it can lead to full control of the affected computer by an outside entity. Users are advised to treat any system with this package as fully compromised.

How To Fix

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

npm uninstall flagstealerfinal

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

There are no effective workarounds for this vulnerability other than removing the package entirely. Users should ensure that they have secured their systems and rotated any sensitive information that may have been exposed.

Conclusion

The flagstealerfinal package contains malicious code that poses a serious security threat to any system where it is installed. Immediate removal of the package and rotation of sensitive information is essential to mitigate the risks associated with this vulnerability. Users are encouraged to utilize tools like Vulert for ongoing monitoring of their software for vulnerabilities.

See every vulnerability recorded for flagstealerfinal →

Share this vulnerability

FAQ

The flagstealerfinal package is an npm library used in JavaScript applications, but it has been compromised with malicious code.

If you have the flagstealerfinal package installed, your system is considered compromised. You should take immediate action to remove it.

After removing the package, rotate all secrets and keys stored on the affected computer to ensure security.

No, there is currently no patched version of the flagstealerfinal package available.

You can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities in your software. You can check your application for vulnerabilities using the Vulert playground without any signup.

How To Fix

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

npm uninstall flagstealerfinal

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