CVE-2021-3766

CRITICALNVD 9.89.8—

9.8

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

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 58.3%
KEV: Not listed

Published

September 6, 2021

Last Modified

November 21, 2024

References (4)

security@huntrhttps://github.com/Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
security@huntrhttps://huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc
af854a3a-2127-422b-91ae-364da2661108https://github.com/Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
af854a3a-2127-422b-91ae-364da2661108https://huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc

Affected Packages

(1 across 1 ecosystem)

npm(1)

Package	Vulnerable range	Fixed in	Dependents
objection	—	2.2.16	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-1321Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 11:02 UTCEG score recompute
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-3766?

CVE-2021-3766 is a critical vulnerability published on September 6, 2021. objection.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

When was CVE-2021-3766 disclosed?

CVE-2021-3766 was first published in the National Vulnerability Database on September 6, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-3766 actively exploited?

CVE-2021-3766 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 58.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-3766?

CVE-2021-3766 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-3766?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-3766, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-3766

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