Prototype Pollution in vincit/objection.js

published 2021-09-06 5 y ago modified 2026-06-17 4 mo ago also GHSA-r659-8xfp-j327 , EUVD-2021-2106

cvss: 7.5; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 73%
public exploits: 0; none known

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

Patch / fix

fixed in 2 links 3

npm objection 2.2.16
vincit vincit/objection.js 2.2.16

github.com/Vincit/objection.js@46b842a commit
github.com/vincit/objection.js@b41aab8 commit
huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc advisory

Exploit prediction

1.47% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

huntr.dev https://huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	objection	<2.2.16	2.2.16

Affected products

vincit vincit/objection.js

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

github.com /Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
web, patch, third-party-advisory
huntr.dev /bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc
web, exploit, issue-tracking, patch, third-party-advisory
github.com /vincit/objection.js/commit/b41aab8dcd78f426f7468dcda541a7aca18a66a6
web
nvd.nist.gov /vuln/detail/CVE-2021-3766
advisory
github.com /vincit/objection.js
package

Sources

CVE List CVE-2021-3766
GitHub Advisory GHSA-r659-8xfp-j327
NVD CVE-2021-3766

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary