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CVE-2026-59880— Immutable.js: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set

Quick assessment

Affected
immutable-js immutable-js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Immutable.js Immutable collections for JavaScript是Immutable.js团队的一系列用于JavaScript的不可变集合数据类库。 Immutable.js Immutable collections for JavaScript 4.3.9之前版本和5.1.8之前版本存在资源管理错误漏洞，该漏洞源于HashCollisionNode碰撞桶中的哈希冲突问题，可能导致攻击者通过控制键值插入，如使用Immutable.Map(obj)、Immutable.f

AI Predicted 7.5 Difficulty: Easy EPSS 0.66% · P51

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
immutable-js immutable-js < 4.3.9 affected
>= 5.0.0-beta.1, < 5.1.8 affected
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I. Basic Information for CVE-2026-59880

Vulnerability Information
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Vulnerability Title
Immutable.js: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set
Source: CVE Program / CVE List V5
Vulnerability Description
Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, Immutable.Map and Immutable.Set keep keys that share the same 32-bit hash in a HashCollisionNode collision bucket that is scanned linearly, allowing an attacker who controls keys inserted into a Map, such as through Immutable.Map(obj), Immutable.fromJS(obj), state.merge(userObject), or mergeDeep, to craft many colliding keys and degrade insertion and lookup to consume disproportionate CPU. This issue is fixed in versions 4.3.9 and 5.1.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
Immutable.js Immutable collections for JavaScript 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Immutable.js Immutable collections for JavaScript是Immutable.js团队的一系列用于JavaScript的不可变集合数据类库。 Immutable.js Immutable collections for JavaScript 4.3.9之前版本和5.1.8之前版本存在资源管理错误漏洞，该漏洞源于HashCollisionNode碰撞桶中的哈希冲突问题，可能导致攻击者通过控制键值插入，如使用Immutable.Map(obj)、Immutable.f
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 < 4.3.9 -

II. Public POCs for CVE-2026-59880

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III. Intelligence Information for CVE-2026-59880

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Patches & Fixes for CVE-2026-59880 (2)

Vendor Advisories for CVE-2026-59880 (1)

Vendor Pages for CVE-2026-59880 (2)

IV. Related Vulnerabilities

Same product: immutable-js
Same vendor: immutable-js
Same weakness: CWE-407

V. Comments for CVE-2026-59880

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