CVE-2026-59880

Description

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.

References

https://github.com/immutable-js/immutable-js/security/advisories/GHSA-xvcm-6775-5m9r

https://github.com/immutable-js/immutable-js/releases/tag/v5.1.8

https://github.com/immutable-js/immutable-js/releases/tag/v4.3.9

https://github.com/immutable-js/immutable-js/commit/e51d49fc612ded5ec4dfb94ff294d22074269b0f

https://github.com/immutable-js/immutable-js/commit/3dd7e5655012597a41873e328bf9142a8901527b

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4