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CVE-2026-29063— Immutable.js: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in immutable

Quick assessment

Affected
immutable-js immutable-js
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Immutable collections for JavaScript是Immutable.js开源的一个不可变数据集合库。 Immutable collections for JavaScript 3.8.3之前版本、4.3.7之前版本和5.1.5之前版本存在安全漏洞，该漏洞源于mergeDeep等API存在原型污染问题。

CVSS 8.7 · High EPSS 0.98% · P60

Affected Version Matrix 3

VendorProduct Version RangeStatus
immutable-js immutable-js < 3.8.3 affected
< 4.3.7 affected
< 5.1.5 affected
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I. Basic Information for CVE-2026-29063

Vulnerability Information
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Vulnerability Title
Immutable.js: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') in immutable
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Immutable collections for JavaScript 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Immutable collections for JavaScript是Immutable.js开源的一个不可变数据集合库。 Immutable collections for JavaScript 3.8.3之前版本、4.3.7之前版本和5.1.5之前版本存在安全漏洞，该漏洞源于mergeDeep等API存在原型污染问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
immutable-js immutable-js < 3.8.3 -

II. Public POCs for CVE-2026-29063

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7509 chars
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III. Intelligence Information for CVE-2026-29063

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Vendor Advisories for CVE-2026-29063 (1)

Vendor Pages for CVE-2026-29063 (3)

IV. Related Vulnerabilities

Same product: immutable-js
Same vendor: immutable-js
Same weakness: CWE-1321

V. Comments for CVE-2026-29063

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