What’s Vulnerable › Vulnerabilities

CVE-2021-42581

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-05-10 · updated 2026-06-17
• Weakness: CWE-1321

Description

Prototype poisoning in function mapObjIndexed in Ramda 0.27.0 and earlier allows attackers to compromise integrity or availability of application via supplying a crafted object (that contains an own property "__proto__") as an argument to the function. NOTE: the vendor disputes this because the observed behavior only means that a user can create objects that the user didn't know would contain custom prototypes

Affected products

• Ramdajs Ramda: through 0.27.0

References

• https://github.com/ramda/ramda/pull/3192
• https://jsfiddle.net/3pomzw5g/2/
• https://github.com/ramda/ramda/pull/3192
• https://jsfiddle.net/3pomzw5g/2/

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