What’s Vulnerable › Vulnerabilities

CVE-2021-23426: Prototype Pollution

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-01 · updated 2026-06-17

Description

This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.

Affected products

• Proto: all versions

References

• https://snyk.io/vuln/SNYK-JS-PROTO-1316301
• https://www.npmjs.com/package/Proto
• https://snyk.io/vuln/SNYK-JS-PROTO-1316301
• https://www.npmjs.com/package/Proto

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