How severe is GHSA-377f-vvrc-9wgg?

GHSA-377f-vvrc-9wgg has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-377f-vvrc-9wgg?

GHSA-377f-vvrc-9wgg affects the following packages: zemen (npm). Ecosystems affected: npm.

How do I fix GHSA-377f-vvrc-9wgg?

Update zemen to 0.0.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-377f-vvrc-9wgg is resolved across your whole dependency graph.

How do I detect GHSA-377f-vvrc-9wgg in my npm dependencies?

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

How do I mitigate GHSA-377f-vvrc-9wgg 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-377f-vvrc-9wgg actively exploited in the wild?

No public exploit code has been indexed for GHSA-377f-vvrc-9wgg 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-377f-vvrc-9wgg published, and has it been updated?

GHSA-377f-vvrc-9wgg was published on September 3, 2020 and was last updated on September 30, 2021. 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

CRITICAL severity

Malicious Package in zemenGHSA-377f-vvrc-9wgg

CRITICAL

GHSA-377f-vvrc-9wgg is a critical-severity (CVSS 9.8) vulnerability in zemen. A fix is available for zemen — see the affected versions and patch details below.

Published

Sep 3, 2020

Updated

Sep 30, 2021

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 30, 2021 · 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.

0other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

zemennpm

72downloads / week

Description

Version 0.0.5 of zemen contained malicious code. The code when executed in the browser would enumerate password, cvc, cardnumber fields from forms and send the extracted values to https://js-metrics.com/minjs.php?pl=

Recommendation

Remove the package from your environment. It's also recommended to evaluate your application to determine whether or not user data was compromised.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`zemen`	≥ 0.0.5&&< 0.0.6	0.0.6`npm install zemen@0.0.6`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for zemen, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update zemen to 0.0.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-377f-vvrc-9wgg 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

Version 0.0.5 of `zemen` contained malicious code. The code when executed in the browser would enumerate password, cvc, cardnumber fields from forms and send the extracted values to `https://js-metrics.com/minjs.php?pl=` ## Recommendation Remove the package from your environment. It's also recommended to evaluate your application to determine whether or not user data was compromised.

O3 Security · Impact-Aware SCA

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