CVE-2026-59879

Immutable.js List contains a 32-bit trie overflow in List.js setListBounds that, prior to versions 4.3.9 and 5.1.8, can mishandle an index or size in the 2^30–2^31 range, leading to an uncatchable infinite loop for empty Lists, unbounded allocation for populated Lists, or silent wrap of large set...

CVE-2026-59880

Immutable.js contains a HashCollision vulnerability in Map/Set keys prior to version 4.3.9 and 5.1.8: an adversary who controls inserted keys can craft many hash collisions in a HashCollisionNode, causing linear scans and CPU exhaustion during insertion and lookup. The issue is fixed in 4.3.9 and...