8.7

CVE-2026-59880: immutable-js immutable Inefficient Algorithmic Complexity

CVSS: 8.7v4.0HighAnalyzed
AliasesUBUNTU-CVE-2026-59880DEBIAN-CVE-2026-59880CGA-38jp-crj3-5465
Published 08-07-2026Last modified 08-07-2026
Open JSON

Vulnerability summary

CVE-2026-59880 is a high (CVSS 8.7) Inefficient Algorithmic Complexity vulnerability in immutable-js immutable. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.9% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
45/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.66%
0%100%
Low · +0.10 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-36JV-9G92-VQ8V

Timeline

  1. 08-07-2026
    PublishedVulnerability first disclosed.
  2. 08-07-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

9 scores · 7 sources · 2 versions

EPSS trend

Probability

0.66%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

+0.10 pp

From 0.57% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.66%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Immutable Js

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Chainguard39 products
  • arangodb-3.11< 3.11.14.5-r13
  • arangodb-3.12< 3.12.9.4-r26
  • argo-workflows-ui-4.0< 4.0.11-r0
  • authentik-2025.12All versions (No fix recorded)
  • authentik-2026.2< 2026.2.6-r11
Wolfi6 products
  • argo-workflows-ui-4.0< 4.0.11-r0
  • nextcloud-server-33< 33.0.7-r1
  • rancher-api-ui< 1.2.3-r9
  • vitess-23< 23.0.5-r6
  • vitess-24< 24.0.2-r7
Immutable-js2 products
Debian1 product
  • node-immutableAll versions (No fix recorded) | < 4.3.9-1
Npm1 product
  • immutable≥ 4.0.0-beta.1, < 4.3.9 | ≥ 5.0.0-beta.1, < 5.1.8 | < 3.8.4
Ubuntu1 product
  • node-immutableAll versions (No fix recorded)

6 vendors · 50 products

References

12 links
Show all 12 references