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CRITICAL severity

CVE-2021-23442 — @cookiex/deep

CRITICALFix: tony-tsx/cookiex-deep@b5bea2b

CVE-2021-23442 is a critical-severity (CVSS 9.8) CWE-1321 vulnerability in @cookiex/deep. 1 public exploit reference exists, so weaponization risk is real. A fix is available for @cookiex/deep — see the affected versions and patch details below.

Prototype Pollution in cookiex/deep

Also known asGHSA-92v9-xh2q-fq9f
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs75th percentile — riskier than 75% of all scored CVEsHighest risk
0.00%0.70%1.39%2.09%0.5%1.6%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2021-23442 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 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.

5other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@cookiex/deepnpm
51downloads / week

Description

The npm @cookiex/deep package before version 0.0.7 has a prototype pollution vulnerability. The global proto object can be polluted using the proto object.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npm@cookiex/deepall versions0.0.7npm install @cookiex/deep@0.0.7

Affected Products

1 product · 1 configurations
Application
cookiex-deepcookiex-deep_project
< 0.0.6
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.

This affects all versions of package @cookiex/deep. The global proto obj…

snyk.ioNVDSep 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update @cookiex/deep to 0.0.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-23442 is resolved across your whole dependency graph.

  3. 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.

Frequently Asked Questions

The npm @cookiex/deep package before version 0.0.7 has a prototype pollution vulnerability. The global proto object can be polluted using the __proto__ object.
O3 Security · Impact-Aware SCA

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CVE-2021-23442: @cookiex/deep — Fixed in 0.0.7