CVE-2026-16266
CVSS Score
4.0
EPSS Score
0.0%
EPSS Percentile
0th
Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in util.js. An attacker can modify the JavaScript prototype chain by supplying a crafted property path containing special keys such as __proto__.
| CWE | CWE-1321 |
| Vendor | n/a |
| Product | mongo-object |
| Published | Jul 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
n/a / mongo-object
0 < 3.0.3
References
security.snyk.io: https://security.snyk.io/vuln/SNYK-JS-MONGOOBJECT-13816714 github.com: https://github.com/longshotlabs/mongo-object/issues/27 github.com: https://github.com/longshotlabs/mongo-object/blob/4f7a570f2a2fcfa9417b7870d5f859e9574ec73c/src/util.ts%23L251 github.com: https://github.com/longshotlabs/mongo-object/commit/638314107d8b397e5453c28e41729522b3e8d67c
Credits
Dezhen Kong