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

​CVE ID :CVE-2026-59879

Published : July 8, 2026, 5:17 p.m. | 1 hour, 53 minutes ago

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.

Severity: 8.7 | HIGH

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