CVE-2026-29063

EUVD-2026-10057
Immutable.js provides many Persistent Immutable data structures. Prior to versions 3.8.3, 4.3.7, and 5.1.5, Prototype Pollution is possible in immutable via the mergeDeep(), mergeDeepWith(), merge(), Map.toJS(), and Map.toObject() APIs. This issue has been patched in versions 3.8.3, 4.3.7, and 5.1.5.
Prototype Pollution
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 23%
Affected Products (NVD)
VendorProductVersion
immutable-jsimmutable
3.0.0 ≤
𝑥
< 3.8.3
immutable-jsimmutable
4.0.0 ≤
𝑥
< 4.3.7
immutable-jsimmutable
5.0.0 ≤
𝑥
< 5.1.5
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
node-immutable
bookworm
no-dsa
bullseye
postponed
forky
4.3.8-2
fixed
sid
4.3.8-2
fixed
trixie
no-dsa
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://github.com/immutable-js/immutable-js/releases/tag/v3.8.3
https://github.com/immutable-js/immutable-js/releases/tag/v4.3.8
https://github.com/immutable-js/immutable-js/releases/tag/v5.1.5
https://github.com/immutable-js/immutable-js/security/advisories/GHSA-wf6x-7x77-mvgw