CVE-2026-59879 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-59879HIGH

immutable-js immutable-js — Immutable.js `List` 32-bit trie overflow → unrecoverable DoS

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   N   N   H    8.7   .0044   36.7     —

AFFECTED
  Product       Versions                    Fixed
  immutable-js  >= 5.0.0-beta.1, < 5.1.8 –  —

TIMELINE
  Jul 7   Reserved by GitHub_M
  Jul 8   EXPLOIT PUBLISHED — CVE-2026-59879 (immutable-js). Public exploit reference added.
  Jul 8   Published (CNA: GitHub_M)

CWE-190, CWE-400, CWE-835, CWE-1284 · CNA: GitHub_M · CVSS v4.0 · 5 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 7, 2026	Reserved	Reserved by GitHub_M
July 8, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-59879 (immutable-js). Public exploit reference added.
July 8, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
immutable-js	immutable-js	—	>= 5.0.0-beta.1, < 5.1.8	—

Weaknesses

CWE-190 · CWE-400 · CWE-835 · CWE-1284

References (5)

https://github.com/immutable-js/immutable-js/commit/a1a1ee412dcaa380ab325196283d06594ffe4b84 [Patch]
https://github.com/immutable-js/immutable-js/commit/f0bc997d8eb9886aff2236635aa210a95a04304a [Patch]
https://github.com/immutable-js/immutable-js/releases/tag/v4.3.9 [Product, Release Notes]
https://github.com/immutable-js/immutable-js/releases/tag/v5.1.8 [Product, Release Notes]
https://github.com/immutable-js/immutable-js/security/advisories/GHSA-v56q-mh7h-f735 [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-59879 at cve.org

Vendors: immutable-js

Weaknesses: CWE-190 · CWE-400 · CWE-835 · CWE-1284

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-59879 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.