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CRITICAL severity

CVE-2021-23484 — zip-local

CRITICALFix: Mostafa-Samir/zip-local@949446a

CVE-2021-23484 is a critical-severity (CVSS 9.8) Path Traversal vulnerability in zip-local. 1 public exploit reference exists, so weaponization risk is real. A fix is available for zip-local — see the affected versions and patch details below.

Exposure of Resource to Wrong Sphere in Zip-Local

Also known asGHSA-wxj7-97fp-j53j
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Sep 27, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs80th percentile — riskier than 80% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-23484 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

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.

136other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
zip-localnpm
31Kdownloads / week

Description

The package zip-local before 0.3.5 are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) which can lead to an extraction of a crafted file outside the intended extraction directory.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmzip-localall versions0.3.5npm install zip-local@0.3.5

Affected Products

1 product · 1 configurations
Application
zip-localzip-local_project
< 0.3.5
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The package zip-local before 0.3.5 are vulnerable to Arbitrary File Writ…

snyk.ioNVDFeb 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update zip-local to 0.3.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-23484 is resolved across your whole dependency graph.

  3. Workarounds

    Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

The package zip-local before 0.3.5 are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) which can lead to an extraction of a crafted file outside the intended extraction directory.
O3 Security · Impact-Aware SCA

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CVE-2021-23484: zip-local — Fixed in 0.3.5