How severe is GHSA-hv4w-jhcj-6wfw?

No CVSS score has been assigned to GHSA-hv4w-jhcj-6wfw yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-hv4w-jhcj-6wfw?

GHSA-hv4w-jhcj-6wfw affects the following packages: snekserve (npm). Ecosystems affected: npm.

How do I fix GHSA-hv4w-jhcj-6wfw?

No patched version of snekserve has shipped for GHSA-hv4w-jhcj-6wfw 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-hv4w-jhcj-6wfw in my npm dependencies?

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

How do I mitigate GHSA-hv4w-jhcj-6wfw if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is GHSA-hv4w-jhcj-6wfw actively exploited in the wild?

No public exploit code has been indexed for GHSA-hv4w-jhcj-6wfw 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-hv4w-jhcj-6wfw published, and has it been updated?

GHSA-hv4w-jhcj-6wfw 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

Cross-Site Scripting in snekserveGHSA-hv4w-jhcj-6wfw

GHSA-hv4w-jhcj-6wfw is a security vulnerability in snekserve. 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, 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

snekservenpm

3downloads / week

Description

All versions of snekserve are vulnerable to Cross-Site Scripting (XSS). The package fails to sanitize filenames, allowing attackers to execute arbitrary JavaScript in the victim's browser through files with names containing malicious code.

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	`snekserve`	≥ 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 snekserve, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of snekserve has shipped for GHSA-hv4w-jhcj-6wfw 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
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

All versions of `snekserve` are vulnerable to Cross-Site Scripting (XSS). The package fails to sanitize filenames, allowing attackers to execute arbitrary JavaScript in the victim's browser through files with names containing malicious code. ## 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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