CVE•Published 2026-07-08•Modified 2026-07-10•0 articles on news•5 live references•NVD data

CVE-2026-59879Immutable-js · Immutable

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS percentile

—

Weaknesses (CWE)

CWE-190Integer Overflow or Wraparound CWE-400Uncontrolled Resource Consumption CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')CWE-1284Improper Validation of Specified Quantity in Input

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.

Timeline

Published 2026-07-08

Modified 2026-07-10

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-59879

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Immutable-js Immutable"

All exposed Immutable-js Immutable instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Immutable"

HTTP body or banner mentions "Immutable" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-59879