CVE-2026-59880

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.

CVSS

No CVSS.

References

Link	Resource
https://github.com/immutable-js/immutable-js/commit/3dd7e5655012597a41873e328bf9142a8901527b
https://github.com/immutable-js/immutable-js/commit/e51d49fc612ded5ec4dfb94ff294d22074269b0f
https://github.com/immutable-js/immutable-js/releases/tag/v4.3.9
https://github.com/immutable-js/immutable-js/releases/tag/v5.1.8
https://github.com/immutable-js/immutable-js/security/advisories/GHSA-xvcm-6775-5m9r
https://github.com/immutable-js/immutable-js/security/advisories/GHSA-xvcm-6775-5m9r

Configurations

No configuration.

History

08 Jul 2026, 17:17

Type	Values Removed	Values Added
References	~~() https://github.com/immutable-js/immutable-js/security/advisories/GHSA-xvcm-6775-5m9r -~~	() https://github.com/immutable-js/immutable-js/security/advisories/GHSA-xvcm-6775-5m9r -

08 Jul 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-08 16:16

Updated : 2026-07-08 17:17

NVD link : CVE-2026-59880

Mitre link : CVE-2026-59880

CVE.ORG link : CVE-2026-59880

JSON object : View

Products Affected

No product.

CWE

CWE-407

Inefficient Algorithmic Complexity

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