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CVE-2026-59879— Immutable.js `List` 32-bit trie overflow → unrecoverable DoS

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之前版本存在安全漏洞，该漏洞源于List#set、List#setSize、List#setIn、List#updateIn及函数set、setIn、updateIn在setListBounds方

AI Predicted 5.3 Difficulty: Moderate EPSS 0.66% · P51

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
immutable-js immutable-js >= 5.0.0-beta.1, < 5.1.8 affected
< 4.3.9 affected
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I. Basic Information for CVE-2026-59879

Vulnerability Information
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Vulnerability Title
Immutable.js `List` 32-bit trie overflow → unrecoverable DoS
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, List#set, List#setSize, List#setIn, List#updateIn, and the functional set, setIn, and updateIn mishandle an index or size in the range 2 ** 30 to 2 ** 31 in setListBounds in src/List.js, causing an empty List to enter an uncatchable infinite loop, a populated List to allocate without bound until process abort, or setSize to silently wrap large values. 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
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Immutable.js Immutable collections for JavaScript 输入验证错误漏洞
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之前版本存在安全漏洞，该漏洞源于List#set、List#setSize、List#setIn、List#updateIn及函数set、setIn、updateIn在setListBounds方
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 >= 5.0.0-beta.1, < 5.1.8 -

II. Public POCs for CVE-2026-59879

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III. Intelligence Information for CVE-2026-59879

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Patches & Fixes for CVE-2026-59879 (2)

Vendor Advisories for CVE-2026-59879 (1)

Vendor Pages for CVE-2026-59879 (2)

IV. Related Vulnerabilities

Same product: immutable-js
Same vendor: immutable-js
Same weakness: CWE-190

V. Comments for CVE-2026-59879

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