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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-wf6x-7x77-mvgw Immutable is vulnerable to Prototype Pollution
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 06 Mar 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 06 Mar 2026 18:45:00 +0000

Type Values Removed Values Added
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.
Title Immutable.js: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in immutable
Weaknesses CWE-1321
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-06T19:33:31.642Z

Reserved: 2026-03-03T20:51:43.481Z

Link: CVE-2026-29063

cve-icon Vulnrichment

Updated: 2026-03-06T19:32:46.434Z

cve-icon NVD

Status : Received

Published: 2026-03-06T19:16:21.557

Modified: 2026-03-06T19:16:21.557

Link: CVE-2026-29063

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses