How severe is GHSA-5947-m4fg-xhqg?

No CVSS score has been assigned to GHSA-5947-m4fg-xhqg yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-5947-m4fg-xhqg?

GHSA-5947-m4fg-xhqg affects the following packages: lodash.mergewith (npm). Ecosystems affected: npm.

How do I fix GHSA-5947-m4fg-xhqg?

Update lodash.mergewith to 4.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5947-m4fg-xhqg is resolved across your whole dependency graph.

How do I detect GHSA-5947-m4fg-xhqg in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for lodash.mergewith, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-5947-m4fg-xhqg if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-5947-m4fg-xhqg actively exploited in the wild?

No public exploit code has been indexed for GHSA-5947-m4fg-xhqg yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-5947-m4fg-xhqg published, and has it been updated?

GHSA-5947-m4fg-xhqg was published on September 3, 2020 and was last updated on August 31, 2020. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

Prototype Pollution in lodash.mergewithGHSA-5947-m4fg-xhqg

GHSA-5947-m4fg-xhqg is a security vulnerability in lodash.mergewith. A fix is available for lodash.mergewith — see the affected versions and patch details below.

Published

Sep 3, 2020

Updated

Aug 31, 2020

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Aug 31, 2020 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

926other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

lodash.mergewithnpm

14.7Mdownloads / week

Description

Versions of lodash.mergewith before 4.6.1 are vulnerable to Prototype Pollution. The function 'mergeWith' 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.

Recommendation

Update to version 4.6.1 or later.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`lodash.mergewith`	all versions	4.6.1`npm install lodash.mergewith@4.6.1`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for lodash.mergewith, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update lodash.mergewith to 4.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5947-m4fg-xhqg is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Versions of `lodash.mergewith` before 4.6.1 are vulnerable to Prototype Pollution. The function 'mergeWith' 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. ## Recommendation Update to version 4.6.1 or later.

O3 Security · Impact-Aware SCA

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