CVE-2026-29063
Immutable.js provides many Persistent Immutable data structures. Prior to versions 3.8.3, 4.3.7, and 5.1.5, Prototype Pollution is possible in immutable via the mergeDeep(), mergeDeepWith(), merge(), Map.toJS(), and Map.toObject() APIs. This issue has been patched in versions 3.8.3, 4.3.7, and 5.1.5.
Published:Mar 6, 2026
Last Modified:Apr 17, 2026
EPS:Mar 6, 2026
EPSS Score:0.00065
CVSS Score:9.8
Affected Products
Vendor
Product
Action
Vendor
Immutable-js
Product
Immutable
Immutable-js
Immutable
Vendor
Immutable-js
Product
Immutable-js
Immutable-js
Immutable-js
Common Weakness Enumeration
Common Attack Pattern Enumeration and Classification (CAPEC)
References
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
