How severe is GHSA-mxmj-84q8-34r7?

No CVSS score has been assigned to GHSA-mxmj-84q8-34r7 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-mxmj-84q8-34r7?

GHSA-mxmj-84q8-34r7 affects the following packages: expressfs (npm). Ecosystems affected: npm.

How do I fix GHSA-mxmj-84q8-34r7?

No patched version of expressfs has shipped for GHSA-mxmj-84q8-34r7 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-mxmj-84q8-34r7 in my npm dependencies?

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

How do I mitigate GHSA-mxmj-84q8-34r7 if there is no patch (or I can't update yet)?

Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Is GHSA-mxmj-84q8-34r7 actively exploited in the wild?

No public exploit code has been indexed for GHSA-mxmj-84q8-34r7 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-mxmj-84q8-34r7 published, and has it been updated?

GHSA-mxmj-84q8-34r7 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

Command Injection in expressfsGHSA-mxmj-84q8-34r7

GHSA-mxmj-84q8-34r7 is a remote code execution vulnerability in expressfs. No vendor fix is recorded yet; mitigation options are listed below.

Published

Sep 3, 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, a proxy for how much of the ecosystem is exposed.

expressfsnpm

0downloads / week

Description

All versions of expressfs are vulnerable to Command Injection. The package does not validate user input on several API endpoints, allowing attackers to run arbitrary commands in the system. The affected endpoints are: expressfs.appendFile, expressfs.cp, expressfs.create and expressfs.rmdir.

Recommendation

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

Affected Packages

1 total

Ecosystem	Package	Vulnerable range	Fix
📦npm	`expressfs`	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 expressfs, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of expressfs has shipped for GHSA-mxmj-84q8-34r7 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
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

All versions of `expressfs` are vulnerable to Command Injection. The package does not validate user input on several API endpoints, allowing attackers to run arbitrary commands in the system. The affected endpoints are: `expressfs.appendFile`, `expressfs.cp`, `expressfs.create` and `expressfs.rmdir`. ## Recommendation No fix is currently available. Consider using an alternative module until a fix is made available.

O3 Security · Impact-Aware SCA

Is GHSA-mxmj-84q8-34r7 in your dependencies?

Find it across npm, including transitive dependencies.

Scan my dependencies How O3 SCA works