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CVE-2026-29063

High

High exploit probability or critical severity with a known exploit.

CVSS base
9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
1.0%
60.6th percentile
CISA KEV
Not listed
Weakness / dates
CWE-915
Published 2026-03-06 · modified 2026-09-10

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.

Affected

immutable-js

References

Official: NVD · CVE.org