# Immutable.js vulnerabilities

Source: https://junglewise.ai/threats/technologies/immutable-js  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/immutable-js.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in Immutable.js: 0 in the last 7 days and 0 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-59879, was published on 8 July 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 3 (1 critical, 0 exploited in the wild)

## About Immutable.js

Immutable.js provides persistent immutable data structures for JavaScript, including List, Stack, Map, OrderedMap, Set, OrderedSet, and Record.

## Latest Immutable.js vulnerabilities

- [CVE-2026-59879: Immutable.js denial of service via integer overflow in List component](https://junglewise.ai/threats/cve-2026-59879-immutable-js-denial-of-service-via-integer-overflow-in-list) (high, CVSS 7.5, published 8 Jul 2026)
- [CVE-2026-59880: Immutable.js denial of service via hash collision in Map and Set](https://junglewise.ai/threats/cve-2026-59880-immutable-js-denial-of-service-via-hash-collision-in-map-and-set) (high, CVSS 4, published 8 Jul 2026)
- [CVE-2026-29063: Immutable.js Prototype Pollution in merge and Map APIs](https://junglewise.ai/threats/cve-2026-29063-immutable-js-prototype-pollution-in-merge-and-map-apis) (critical, CVSS 9.8, published 6 Mar 2026)

## Most severe Immutable.js vulnerabilities

- [CVE-2026-29063: Immutable.js Prototype Pollution in merge and Map APIs](https://junglewise.ai/threats/cve-2026-29063-immutable-js-prototype-pollution-in-merge-and-map-apis) (critical, CVSS 9.8, published 6 Mar 2026)
- [CVE-2026-59879: Immutable.js denial of service via integer overflow in List component](https://junglewise.ai/threats/cve-2026-59879-immutable-js-denial-of-service-via-integer-overflow-in-list) (high, CVSS 7.5, published 8 Jul 2026)
- [CVE-2026-59880: Immutable.js denial of service via hash collision in Map and Set](https://junglewise.ai/threats/cve-2026-59880-immutable-js-denial-of-service-via-hash-collision-in-map-and-set) (high, CVSS 4, published 8 Jul 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Immutable.js vulnerabilities", https://junglewise.ai/threats/technologies/immutable-js, 9 November 2026.