CVE-2026-29063

HIGH EPSS 44.8%
Published Mar 6, 20263mo ago · Modified Jun 17, 20262w ago
8.7 CVSS 4.0
High
Find Similar
Published Mar 6, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
8.7
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/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
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
44.8% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-1321

Affected Products 3

VendorProductVersionRange
immutable-jsimmutable*≥3.0.0  –  <3.8.3
immutable-jsimmutable*≥4.0.0  –  <4.3.7
immutable-jsimmutable*≥5.0.0  –  <5.1.5

References 4

  • github.com https://github.com/immutable-js/immutable-js/releases/tag/v3.8.3
    Release Notes
  • github.com https://github.com/immutable-js/immutable-js/releases/tag/v4.3.8
    Release Notes
  • github.com https://github.com/immutable-js/immutable-js/releases/tag/v5.1.5
    Release Notes
  • github.com https://github.com/immutable-js/immutable-js/security/advisories/GHSA-wf6x-7x77-mvgw
    ExploitVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.