Vulnerability Details CVE-2026-29063
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 20.2%
CVSS Severity
CVSS v3 Score 9.8
References
Products affected by CVE-2026-29063
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cpe:2.3:a:immutable-js:immutable:3.0.0
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cpe:2.3:a:immutable-js:immutable:3.0.1
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cpe:2.3:a:immutable-js:immutable:3.0.2
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cpe:2.3:a:immutable-js:immutable:3.0.3
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cpe:2.3:a:immutable-js:immutable:3.1.0
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cpe:2.3:a:immutable-js:immutable:3.2.0
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cpe:2.3:a:immutable-js:immutable:3.2.1
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cpe:2.3:a:immutable-js:immutable:3.3.0
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cpe:2.3:a:immutable-js:immutable:3.4.0
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cpe:2.3:a:immutable-js:immutable:3.4.1
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cpe:2.3:a:immutable-js:immutable:3.5.0
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cpe:2.3:a:immutable-js:immutable:3.6.0
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cpe:2.3:a:immutable-js:immutable:3.6.1
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cpe:2.3:a:immutable-js:immutable:3.6.2
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cpe:2.3:a:immutable-js:immutable:3.6.3
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cpe:2.3:a:immutable-js:immutable:3.6.4
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cpe:2.3:a:immutable-js:immutable:3.7.0
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cpe:2.3:a:immutable-js:immutable:3.7.1
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cpe:2.3:a:immutable-js:immutable:3.7.2
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cpe:2.3:a:immutable-js:immutable:3.7.3
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cpe:2.3:a:immutable-js:immutable:3.7.4
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cpe:2.3:a:immutable-js:immutable:3.7.5
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cpe:2.3:a:immutable-js:immutable:3.7.6
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cpe:2.3:a:immutable-js:immutable:3.8.0
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cpe:2.3:a:immutable-js:immutable:3.8.1
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cpe:2.3:a:immutable-js:immutable:3.8.2
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cpe:2.3:a:immutable-js:immutable:4.0.0
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cpe:2.3:a:immutable-js:immutable:4.1.0
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cpe:2.3:a:immutable-js:immutable:4.2.0
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cpe:2.3:a:immutable-js:immutable:4.2.1
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cpe:2.3:a:immutable-js:immutable:4.2.2
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cpe:2.3:a:immutable-js:immutable:4.2.3
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cpe:2.3:a:immutable-js:immutable:4.2.4
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cpe:2.3:a:immutable-js:immutable:4.3.0
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cpe:2.3:a:immutable-js:immutable:4.3.1
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cpe:2.3:a:immutable-js:immutable:4.3.2
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cpe:2.3:a:immutable-js:immutable:4.3.3
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cpe:2.3:a:immutable-js:immutable:4.3.4
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cpe:2.3:a:immutable-js:immutable:4.3.5
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cpe:2.3:a:immutable-js:immutable:4.3.6
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cpe:2.3:a:immutable-js:immutable:5.0.0
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cpe:2.3:a:immutable-js:immutable:5.0.1
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cpe:2.3:a:immutable-js:immutable:5.0.2
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cpe:2.3:a:immutable-js:immutable:5.0.3
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cpe:2.3:a:immutable-js:immutable:5.1.0
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cpe:2.3:a:immutable-js:immutable:5.1.1
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cpe:2.3:a:immutable-js:immutable:5.1.2
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cpe:2.3:a:immutable-js:immutable:5.1.3
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cpe:2.3:a:immutable-js:immutable:5.1.4