What’s Vulnerable › Vulnerabilities

CVE-2021-23421: 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: 2021-08-11 · updated 2026-06-17
• Weakness: CWE-1321

Description

All versions of package merge-change are vulnerable to Prototype Pollution via the utils.set function.

Affected products

• merge-change: all versions

References

• https://github.com/VladimirShestakov/merge-change/blob/9901f145e06158f284f52de42e6ba5b0f702fb65/utils.js%23L89-L123
• https://snyk.io/vuln/SNYK-JS-MERGECHANGE-1310985
• https://github.com/VladimirShestakov/merge-change/blob/9901f145e06158f284f52de42e6ba5b0f702fb65/utils.js%23L89-L123
• https://snyk.io/vuln/SNYK-JS-MERGECHANGE-1310985

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