CVE-2026-59879

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

Published Jul 8, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-v56q-mh7h-f735 Immutable.js `List` 32-bit trie overflow → unrecoverable DoS
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Immutable-js
Immutable-js immutable-js
Vendors & Products Immutable-js
Immutable-js immutable-js
Type Values Removed Values Added
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.
Title Immutable.js `List` 32-bit trie overflow → unrecoverable DoS
Weaknesses CWE-1284
CWE-190
CWE-400
CWE-835
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 8, 2026, 7:41 PM
Reserved
Jul 7, 2026, 4:40 PM
Status
Analyzed
Published
Jul 8, 2026, 5:17 PM
Modified
Jul 10, 2026, 6:48 PM