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. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-xw79-hhv6-578c 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.

How does O3 Security protect against GHSA-xw79-hhv6-578c?

O3 pinpoints whether GHSA-xw79-hhv6-578c is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

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

GHSA-xw79-hhv6-578c

Fix: zeit/serve-handler@65b4d41

GHSA-xw79-hhv6-578c is a security vulnerability in serve. O3 Security confirms whether GHSA-xw79-hhv6-578c is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Cross-Site Scripting in serve

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.

825other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

servenpm

4.2Mdownloads / 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

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for serve. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
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
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.
How O3 protects you
O3 pinpoints whether GHSA-xw79-hhv6-578c is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-xw79-hhv6-578c. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

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

Is GHSA-xw79-hhv6-578c in your dependencies?

O3 detects GHSA-xw79-hhv6-578c across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works