How severe is GHSA-c6f3-3c98-2j2f?

GHSA-c6f3-3c98-2j2f has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-c6f3-3c98-2j2f?

GHSA-c6f3-3c98-2j2f affects the following packages: jquerz (npm). Ecosystems affected: npm.

How do I fix GHSA-c6f3-3c98-2j2f?

No patched version of jquerz has shipped for GHSA-c6f3-3c98-2j2f 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-c6f3-3c98-2j2f in my npm dependencies?

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

How do I mitigate GHSA-c6f3-3c98-2j2f 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-c6f3-3c98-2j2f actively exploited in the wild?

No public exploit code has been indexed for GHSA-c6f3-3c98-2j2f 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-c6f3-3c98-2j2f published, and has it been updated?

GHSA-c6f3-3c98-2j2f was published on September 2, 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 jquerzGHSA-c6f3-3c98-2j2f

CRITICAL

GHSA-c6f3-3c98-2j2f is a critical-severity (CVSS 9.8) vulnerability in jquerz. No vendor fix is recorded yet; mitigation options are listed below.

Published

Sep 2, 2020

Updated

Sep 30, 2021

Affected

1 pkg

Patched

None yet

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, a proxy for how much of the ecosystem is exposed.

jquerznpm

59downloads / week

Description

Version 1.0.1 of jquerz contains malicious code as a preinstall script. The package is malware designed to take advantage of users making a mistake when typing the name of a module to install. When installed, the package downloads a file from a remote server, executes it and opens a backdoor.

Recommendation

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer.

The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
📦npm	`jquerz`	all versions	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 jquerz, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of jquerz has shipped for GHSA-c6f3-3c98-2j2f 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

Version 1.0.1 of `jquerz` contains malicious code as a preinstall script. The package is malware designed to take advantage of users making a mistake when typing the name of a module to install. When installed, the package downloads a file from a remote server, executes it and opens a backdoor. ## Recommendation Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been giv

O3 Security · Impact-Aware SCA

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