What is GHSA-9X64-5R7X-2Q53?

GHSA-9X64-5R7X-2Q53 is a critical-severity security vulnerability in flatmap-stream (npm), affecting versions = 0.1.1. No fixed version is listed yet.

How severe is GHSA-9X64-5R7X-2Q53?

GHSA-9X64-5R7X-2Q53 has a CVSS score of 9.8 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of flatmap-stream are affected by GHSA-9X64-5R7X-2Q53?

flatmap-stream (npm) versions = 0.1.1 is affected.

Is there a fix for GHSA-9X64-5R7X-2Q53?

No fixed version is listed for GHSA-9X64-5R7X-2Q53 yet. Monitor the advisory for updates and apply mitigations in the interim.

Is GHSA-9X64-5R7X-2Q53 exploitable, and should I be worried?

Whether GHSA-9X64-5R7X-2Q53 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk.

What actually determines whether GHSA-9X64-5R7X-2Q53 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

GHSA-9X64-5R7X-2Q53 in flatmap-stream

Summary

Malicious Package in flatmap-stream

Version 0.1.1 of flatmap-stream is considered malicious.

This module runs an encrypted payload targeting a very specific application, copay and because they shared the same description it would have likely worked for copay-dash.

The injected code:

Read in AES encrypted data from a file disguised as a test fixture
Grabbed the npm package description of the module that imported it, using an automatically set environment variable
Used the package description as a key to decrypt a chunk of data pulled in from the disguised file

The decrypted data was part of a module, which was then compiled in memory and executed.

This module performed the following actions:

Decrypted another chunk of data from the disguised file
Concatenated a small, commented prefix from the first decrypted chunk to the end of the second decrypted chunk
Performed minor decoding tasks to transform the concatenated block of code from invalid JS to valid JS (we believe this was done to evade detection by dynamic analysis tools)
Wrote this processed block of JS out to a file stored in a dependency that would be packaged by the build scripts:

The chunk of code that was written out was the actual malicious code, intended to be run on devices owned by the end users of Copay.

This code would do the following:

Detect the current environment: Mobile/Cordova/Electron
Check the Bitcoin and Bitcoin Cash balances on the victim's copay account
If the current balance was greater than 100 Bitcoin, or 1000 Bitcoin Cash:
- Harvest the victim's account data in full
- Harvest the victim's copay private keys
- Send the victim's account data/private keys off to a collection

Impact

GHSA-9X64-5R7X-2Q53 has a CVSS score of 9.8 (Critical). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. No fixed version is listed yet, so configuration controls and monitoring matter more in the interim.

Affected versions

flatmap-stream (= 0.1.1)

Security releases

Not available

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

If you find this module in your environment it's best to remove it. The malicious version of event-stream and flatmap-stream have been removed from the npm Registry.

Frequently Asked Questions

What is GHSA-9X64-5R7X-2Q53? GHSA-9X64-5R7X-2Q53 is a critical-severity security vulnerability in flatmap-stream (npm), affecting versions = 0.1.1. No fixed version is listed yet.
How severe is GHSA-9X64-5R7X-2Q53? GHSA-9X64-5R7X-2Q53 has a CVSS score of 9.8 (Critical). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
Which versions of flatmap-stream are affected by GHSA-9X64-5R7X-2Q53? flatmap-stream (npm) versions = 0.1.1 is affected.
Is there a fix for GHSA-9X64-5R7X-2Q53? No fixed version is listed for GHSA-9X64-5R7X-2Q53 yet. Monitor the advisory for updates and apply mitigations in the interim.
Is GHSA-9X64-5R7X-2Q53 exploitable, and should I be worried? Whether GHSA-9X64-5R7X-2Q53 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
What actually determines whether GHSA-9X64-5R7X-2Q53 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.