CVE catalog
CVE-2026-29063
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(),
- Severity
- High · CVSS 8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.01% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | node-immutable | sid | 5.1.9-1 | fixed |
| Debian | node-immutable | forky | 5.1.9-1 | fixed |
| Debian | node-immutable | trixie | 4.3.4-1 | vulnerable |
| Debian | node-immutable | bookworm | 4.1.0-3 | vulnerable |
| Npm | immutable | Not reported | 4.3.8 | fixed |
| Npm | immutable | Not reported | 5.1.5 | fixed |
| Cpe | node-immutable | Not reported | Not reported | vulnerable |
| Cpe | immutable | Not reported | 5.1.5 | fixed |
| Ubuntu | node-immutable | 20.04 | 3.8.2+dfsg-3 | vulnerable |
| Ubuntu | node-immutable | 22.04 | 3.8.2+dfsg-3 | vulnerable |
| Ubuntu | node-immutable | 22.04 | 4.0.0-1 | vulnerable |
| Ubuntu | node-immutable | 22.04 | 4.0.0-2 | vulnerable |
| Ubuntu | node-immutable | 24.04 | 4.1.0-3 | vulnerable |
| Ubuntu | node-immutable | 24.04 | 4.3.4-1 | vulnerable |
| Ubuntu | node-immutable | 25.10 | 4.3.4-1 | vulnerable |
| Ubuntu | node-immutable | 26.04 | 4.3.4-1 | vulnerable |
| Ubuntu | node-immutable | 26.04 | 4.3.8-2 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | node-immutable | source | sid | 4.3.8-1 | not yet assigned | Not reported | Not reported |
| Debian | node-immutable | source | forky | 4.3.8-1 | not yet assigned | Not reported | Not reported |
| Debian | node-immutable | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | node-immutable | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Npm | immutable | npm | Not reported | 4.3.8 | Not reported | Not reported | Not reported |
| Npm | immutable | npm | Not reported | 5.1.5 | Not reported | Not reported | Not reported |
| Cpe | immutable | cpe | Not reported | 5.1.5 | Not reported | NVD-CVE-2026-29063 | Not reported |
Notes
[trixie] node-immutable: Minor issue [bookworm] node-immutable: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [node-immutable]Affected
Details (2)
4.1.0-3· all · bookwormAffected
nvd · node-immutable · debian · bookworm; nvd · node-immutable · debian · 12
4.1.0-3· all · bookwormAffected
nvd · node-immutable · debian · bookworm; nvd · node-immutable · debian · 12
[Debian 13 (Trixie)]
- [node-immutable]Affected
Details (2)
4.3.4-1· all · trixieAffected
nvd · node-immutable · debian · 13
4.3.4-1· all · trixieAffected
nvd · node-immutable · debian · 13
Observed:
References
- [https://github.com/advisories/GHSA-wf6x-7x77-mvgw]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-29063]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-29063]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-29063]
- [https://security-tracker.debian.org/tracker/CVE-2026-29063]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29063.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1229.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]