node-immutable: Immutable.js provides many Persistent Immutable data structures
CVE-2026-59880 is fixed in node-immutable on 1 platform by DEBIAN-CVE-2026-59880 (version 4.3.9-1), released July 8, 2026. It is not reported as exploited. Patch Radar priority: High.
Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, Immutable.Map and Immutable.Set keep keys that share the same 32-bit hash in a HashCollisionNode collision bucket that is scanned linearly, allowing an attacker who controls keys inserted into a Map, such as through Immutable.Map(obj), Immutable.fromJS(obj), state.merge(userObject), or mergeDeep, to craft many colliding keys and degrade insertion and lookup to consume disproportionate CPU. This issue is fixed in versions 4.3.9 and 5.1.8.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| node-immutable · Debian 14 | 4.3.9-1 | DEBIAN-CVE-2026-59880 | Jul 8, 2026 |
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