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CVE-2026-59880

HIGH Exploitation: PoC
8.7
CVSS 4.0
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.

Metadata

CVE ID
CVE-2026-59880
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-07-07 16:40 UTC
Published
2026-07-08 15:44 UTC
Last updated
2026-07-08 16:13 UTC
Primary CWE
CWE-407
CWE-407: Inefficient Algorithmic Complexity
Vendor / Product
immutable-js / immutable-js
Sources
cve.org  ·  NVD

Severity & Metrics

8.7 HIGH CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
immutable-js immutable-js — < 4.3.9, >= 5.0.0-beta.1, < 5.1.8
Weakness (CWE)
CWESourceDescription
CWE-407 cna CWE-407: Inefficient Algorithmic Complexity
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.7 HIGH 4.0 cna CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References (5)
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