Summary
Prototype Pollution in lodash.merge
Versions of lodash.merge before 4.6.1 are vulnerable to Prototype Pollution. The function 'merge' may allow a malicious user to modify the prototype of Object via __proto__ causing the addition or modification of an existing property that will exist on all objects.
Impact
Affected versions
Security releases
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.
Already deployed Kodem?
See it in your environmentNew to Kodem? Get a demo →Remediation advice
Update to version 4.6.1 or later.
Frequently Asked Questions
- What is GHSA-2M96-9W4J-WGV7? GHSA-2M96-9W4J-WGV7 is a high-severity security vulnerability in lodash.merge (npm), affecting versions < 4.6.1. It is fixed in 4.6.1.
- Which versions of lodash.merge are affected by GHSA-2M96-9W4J-WGV7? lodash.merge (npm) versions < 4.6.1 is affected.
- Is there a fix for GHSA-2M96-9W4J-WGV7? Yes. GHSA-2M96-9W4J-WGV7 is fixed in 4.6.1. Upgrade to this version or later.
- Is GHSA-2M96-9W4J-WGV7 exploitable, and should I be worried? Whether GHSA-2M96-9W4J-WGV7 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-2M96-9W4J-WGV7 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.
- How do I fix GHSA-2M96-9W4J-WGV7? Upgrade
lodash.mergeto 4.6.1 or later.