How severe is GHSA-xw79-hhv6-578c?

No CVSS score has been assigned to GHSA-xw79-hhv6-578c yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-xw79-hhv6-578c?

GHSA-xw79-hhv6-578c affects the following packages: serve (npm). Ecosystems affected: npm.

How do I fix GHSA-xw79-hhv6-578c?

Update serve to 10.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xw79-hhv6-578c is resolved across your whole dependency graph.

How do I detect GHSA-xw79-hhv6-578c in my npm dependencies?

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

How do I mitigate GHSA-xw79-hhv6-578c 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-xw79-hhv6-578c actively exploited in the wild?

No public exploit code has been indexed for GHSA-xw79-hhv6-578c 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-xw79-hhv6-578c published, and has it been updated?

GHSA-xw79-hhv6-578c was published on September 11, 2020 and was last updated on September 28, 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

Cross-Site Scripting in serveGHSA-xw79-hhv6-578c

Fix: zeit/serve-handler@65b4d41

GHSA-xw79-hhv6-578c is a security vulnerability in serve. A fix is available for serve — see the affected versions and patch details below.

Published

Sep 11, 2020

Updated

Sep 28, 2021

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 28, 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.

827other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

servenpm

2.3Mdownloads / week

Description

Versions of serve prior to 10.0.2 are vulnerable to Cross-Site Scripting (XSS). The package does not encode output, allowing attackers to execute arbitrary JavaScript in the victim's browser if user-supplied input is rendered.

Recommendation

Upgrade to version 10.0.2 or later.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`serve`	all versions	10.0.2`npm install serve@10.0.2`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for serve, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update serve to 10.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xw79-hhv6-578c is resolved across your whole dependency graph.
Workarounds
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

Versions of `serve` prior to 10.0.2 are vulnerable to Cross-Site Scripting (XSS). The package does not encode output, allowing attackers to execute arbitrary JavaScript in the victim's browser if user-supplied input is rendered. ## Recommendation Upgrade to version 10.0.2 or later.

O3 Security · Impact-Aware SCA

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