CVE-2026-29063

CriticalCVSS 9.8/10Last modified Oct 30, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-1321 CWE-915

Affected software

No affected versions have been published.

Timeline

Published: Mar 6, 2026
Last modified: Oct 30, 2026
NVD status: Analyzed

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