What’s Vulnerable › Vulnerabilities

CVE-2021-23442: Prototype Pollution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-17 · updated 2026-06-17
• Weakness: CWE-1321

Description

This affects all versions of package @cookiex/deep. The global proto object can be polluted using the __proto__ object.

Affected products

• Cookiex-Deep Project Cookiex-Deep: before 0.0.6 — fixed in 0.0.6

How to fix

Upgrade to a fixed version: Cookiex-Deep Project Cookiex-Deep 0.0.6. Check the vendor advisory for mitigations.

References

• https://github.com/tony-tsx/cookiex-deep/commit/b5bea2b7f34a5fa9abb4446cbd038ecdbcd09c88
• https://github.com/tony-tsx/cookiex-deep/issues/1
• https://snyk.io/vuln/SNYK-JS-COOKIEXDEEP-1582793
• https://github.com/tony-tsx/cookiex-deep/commit/b5bea2b7f34a5fa9abb4446cbd038ecdbcd09c88
• https://github.com/tony-tsx/cookiex-deep/issues/1
• https://snyk.io/vuln/SNYK-JS-COOKIEXDEEP-1582793

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