CVE-2021-3766
Prototype Pollution in vincit/objection.js
objection.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Prototype Pollution in vincit/objection.js
objection.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
- Record
CVE-2021-3766- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-1321
- Updated
- 2026-11-02
EUVDEUVD-2021-2106
objection.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
- Record
EUVD-2021-2106- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-r659-8xfp-j327
objection.js Prototype Pollution vulnerability
objection.js prior to version 2.2.16 is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'). This issue is patched in version 2.2.16.
- Record
GHSA-r659-8xfp-j327- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-915, CWE-1321
- Updated
- 2026-11-02
NVD
objection.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
- Record
CVE-2021-3766- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSV
objection.js is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
- Record
CVE-2021-3766- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-r659-8xfp-j327
objection.js Prototype Pollution vulnerability
objection.js prior to version 2.2.16 is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'). This issue is patched in version 2.2.16.
- Record
GHSA-r659-8xfp-j327- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-1321, CWE-915
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
objectionnpm | before 2.2.16 | 2.2.16 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3766 is a high vulnerability (CVSS 7.5) in Objection Project Objection, published September 6, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.47%, the 74th percentile. Fixed in objection 2.2.16.
References
huntr.dev/bounties/c98e0f0e-ebf2-4072-be73-a1848ea031cc
github.com/Vincit/objection.js/commit/46b842a6bc897198b83f41ac85c92864b991d7e9
nvd.nist.gov/vuln/detail/CVE-2021-3766