Riskcovery

CVE-2026-29063

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

State
Published
Severity
8.7 High
Published
Mar 6, 2026
Updated
Sep 10, 2026
Reserved
Mar 3, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
4.08.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:NGitHub_M
3.18.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hredhat-SADP

Weaknesses

  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
  • CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes

Affected Products

ProductVersions
immutable-jsimmutable-js
  • < 3.8.3Affected
  • < 4.3.7Affected
  • < 5.1.5Affected

References

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