CVE-2026-29063 Immutable.js: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in immutable

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...