What’s Vulnerable › Vulnerabilities

CVE-2021-3766: Prototype Pollution in vincit/objection.js

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-06 · updated 2026-06-17
• Weakness: CWE-1321

Description

objection.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Affected products

• vincit/objection.js: before 2.2.16 — fixed in 2.2.16

How to fix

Upgrade to a fixed version: vincit/objection.js 2.2.16. Check the vendor advisory for mitigations.

References

• https://github.com/Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
• https://huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc
• https://github.com/Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
• https://huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc

Get alerted when CVE-2021-3766 or the next vulnerability affects your stack