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CVE-2026-29063

CRITICAL CVSS: 9.8 Published: 2026-03-06 Modified: 2026-08-19

Description

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.

Affected Platforms

Immutable-Js Immutable

Weakness Type

CWE-1321, CWE-915

References