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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-59879

34
FAUCET Score

Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, List#set, List#setSize, List#setIn, List#updateIn, and the functional set, setIn, and updateIn mishandle an index or size in the range 2 ** 30 to 2 ** 31 in setListBounds in src/List.js, causing an empty List to enter an uncatchable infinite loop, a populated List to allocate without bound until process abort, or setSize to silently wrap large values. This issue is fixed in versions 4.3.9 and 5.1.8.

First published: Jul 8, 2026Last modified: Jul 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 4.3.9CPE matchmatch criteria
cpe:2.3:a:immutable-js:immutable:*:*:*:*:*:node.js:*:*
>= 5.0.0, < 5.1.8CPE matchmatch criteria
cpe:2.3:a:immutable-js:immutable:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 4.0

8.7HIGH

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
35.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 15th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: immutableFixed in: 4.3.9
npmpatch availablevia ghsa
Product: immutableFixed in: 5.1.8

Vendor Advisories (1)

npmGHSA-v56q-mh7h-f735high

Immutable.js `List` 32-bit trie overflow → unrecoverable DoS

Jul 21, 2026

References

github.com / immutable-js/immutable-js/commit/a1a1ee412dcaa380ab325196283d06594ffe4b84
Patch
github.com / immutable-js/immutable-js/commit/f0bc997d8eb9886aff2236635aa210a95a04304a
Patch
github.com / immutable-js/immutable-js/releases/tag/v4.3.9
ProductRelease Notes
github.com / immutable-js/immutable-js/releases/tag/v5.1.8
ProductRelease Notes
github.com / immutable-js/immutable-js/security/advisories/GHSA-v56q-mh7h-f735
ExploitMitigationVendor Advisory