What’s Vulnerable › Vulnerabilities

CVE-2021-23820: Prototype Pollution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-03 · updated 2026-06-17
• Weakness: CWE-843

Description

This affects all versions of package json-pointer. A type confusion vulnerability can lead to a bypass of CVE-2020-7709 when the pointer components are arrays.

Affected products

• json-pointer: before 0.6.2 — fixed in 0.6.2

How to fix

Upgrade to a fixed version: json-pointer 0.6.2. Check the vendor advisory for mitigations.

References

• https://github.com/manuelstofer/json-pointer/blob/master/index.js%23L78
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1910686
• https://snyk.io/vuln/SNYK-JS-JSONPOINTER-1577287
• https://github.com/manuelstofer/json-pointer/blob/master/index.js%23L78
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1910686
• https://snyk.io/vuln/SNYK-JS-JSONPOINTER-1577287

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