CVE-2026-29063Immutable.js provides many Persistent Immutable data structures.
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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
- 9.8 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-1321, CWE-915
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Sep 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
immutable-js immutable immutable-js:immutable | from 3.0.0 before 3.8.3; from 4.0.0 before 4.3.7; from 5.0.0 before 5.1.5 | NVD |
References
- https://github.com/immutable-js/immutable-js/releases/tag/v3.8.3release-notes
- https://github.com/immutable-js/immutable-js/releases/tag/v4.3.8release-notes
- https://github.com/immutable-js/immutable-js/releases/tag/v5.1.5release-notes
- https://github.com/immutable-js/immutable-js/security/advisories/GHSA-wf6x-7x77-mvgwexploit, vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:11070
- https://access.redhat.com/errata/RHSA-2026:11217
- https://access.redhat.com/errata/RHSA-2026:11414
- https://access.redhat.com/errata/RHSA-2026:11858
- https://access.redhat.com/errata/RHSA-2026:11916
- https://access.redhat.com/errata/RHSA-2026:12118
- https://access.redhat.com/errata/RHSA-2026:13542
- https://access.redhat.com/errata/RHSA-2026:13548
- https://access.redhat.com/errata/RHSA-2026:13791
- https://access.redhat.com/errata/RHSA-2026:13826
- https://access.redhat.com/errata/RHSA-2026:13829
- https://access.redhat.com/errata/RHSA-2026:13847
- https://access.redhat.com/errata/RHSA-2026:13853
- https://access.redhat.com/errata/RHSA-2026:17469
- https://access.redhat.com/errata/RHSA-2026:17598
- https://access.redhat.com/errata/RHSA-2026:19375
- https://access.redhat.com/errata/RHSA-2026:19409
- https://access.redhat.com/errata/RHSA-2026:19410
- https://access.redhat.com/errata/RHSA-2026:19712
- https://access.redhat.com/errata/RHSA-2026:20034
- https://access.redhat.com/errata/RHSA-2026:20041
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.