CVE-2026-29063

CVE-2026-29063 affects Immutable.js, where prototype pollution is possible via mergeDeep(), mergeDeepWith(), merge(), Map.toJS(), and Map.toObject() APIs in versions prior to 3.8.3, 4.3.7, and 5.1.5. IBM security bulletins corroborate the issue and list affected IBM products (e.g., Cloud Pak for ...