What’s Vulnerable › Vulnerabilities

CVE-2021-23452: 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: 2021-10-20 · updated 2026-06-17
• Weakness: CWE-1321

Description

This affects all versions of package x-assign. The global proto object can be polluted using the __proto__ object.

Affected products

• x-assign: all versions

References

• https://runkit.com/embed/sq8qjwemyn8t
• https://snyk.io/vuln/SNYK-JS-XASSIGN-1759314
• https://runkit.com/embed/sq8qjwemyn8t
• https://snyk.io/vuln/SNYK-JS-XASSIGN-1759314

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