What’s Vulnerable › Vulnerabilities

CVE-2021-23329: Prototype Pollution

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-31 · updated 2026-06-17
• Weakness: CWE-1321

Description

The package nested-object-assign before 1.0.4 are vulnerable to Prototype Pollution via the default function, as demonstrated by running the PoC below.

Affected products

• nested-object-assign: before 1.0.4 — fixed in 1.0.4

How to fix

Upgrade to a fixed version: nested-object-assign 1.0.4. Check the vendor advisory for mitigations.

References

• https://github.com/Geta/NestedObjectAssign/pull/11
• https://snyk.io/vuln/SNYK-JS-NESTEDOBJECTASSIGN-1065977
• https://github.com/Geta/NestedObjectAssign/pull/11
• https://snyk.io/vuln/SNYK-JS-NESTEDOBJECTASSIGN-1065977

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