How severe is GHSA-6fh5-8wq8-w3wr?

No CVSS score has been assigned to GHSA-6fh5-8wq8-w3wr yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-6fh5-8wq8-w3wr?

GHSA-6fh5-8wq8-w3wr affects the following packages: unflatten (npm). Ecosystems affected: npm.

How do I fix GHSA-6fh5-8wq8-w3wr?

No patched version of unflatten has shipped for GHSA-6fh5-8wq8-w3wr yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

How do I detect GHSA-6fh5-8wq8-w3wr in my npm dependencies?

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

How do I mitigate GHSA-6fh5-8wq8-w3wr 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-6fh5-8wq8-w3wr actively exploited in the wild?

No public exploit code has been indexed for GHSA-6fh5-8wq8-w3wr 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-6fh5-8wq8-w3wr published, and has it been updated?

GHSA-6fh5-8wq8-w3wr was published on September 4, 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 unflattenGHSA-6fh5-8wq8-w3wr

GHSA-6fh5-8wq8-w3wr is a security vulnerability in unflatten. No vendor fix is recorded yet; mitigation options are listed below.

Published

Sep 4, 2020

Updated

Aug 31, 2020

Affected

1 pkg

Patched

None yet

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.

12other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

unflattennpm

570downloads / week

Description

All versions of unflatten are vulnerable to prototype pollution. The function unflatten does not restrict the modification of an Object's prototype, which may allow an attacker to add or modify an existing property that will exist on all objects.

Recommendation

No fix is currently available. Consider using an alternative package until a fix is made available.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
📦npm	`unflatten`	≥ 0.0.0	No fix

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for unflatten, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of unflatten has shipped for GHSA-6fh5-8wq8-w3wr yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
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

All versions of `unflatten` are vulnerable to prototype pollution. The function `unflatten` does not restrict the modification of an Object's prototype, which may allow an attacker to add or modify an existing property that will exist on all objects. ## Recommendation No fix is currently available. Consider using an alternative package until a fix is made available.

O3 Security · Impact-Aware SCA

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