What’s Vulnerable › Vulnerabilities

CVE-2021-23417: Prototype Pollution

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-28 · updated 2026-06-17
• Weakness: CWE-1321

Description

All versions of package deepmergefn are vulnerable to Prototype Pollution via deepMerge function.

Affected products

• deepmergefn: all versions

References

• https://github.com/jesusgm/deepmergefn/blob/master/index.js%23L6
• https://snyk.io/vuln/SNYK-JS-DEEPMERGEFN-1310984
• https://github.com/jesusgm/deepmergefn/blob/master/index.js%23L6
• https://snyk.io/vuln/SNYK-JS-DEEPMERGEFN-1310984

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