merge-deep node module before 3.0.1 suffers from a Modification of Assumed-Immutable Data…
Priority MEDIUM 42CWE-471Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub.
Summary
merge-deep node module before 3.0.1 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of "Object" via __proto__, causing the addition or modification of an existing property that will exist on all objects.
Why it matters now
EPSS 0.02004 80th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed merge-deep node module (HackerOne): 3.0.1merge-deep (npm): 3.0.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| HackerOne | merge-deep node module | before 3.0.1 | 3.0.1 | Patch available | CNA |
| — | merge-deep (npm) | before 3.0.1 | 3.0.1 | Patch available | GHSA-9g9w-hmvj-5h57 |
- merge-deep node module VendorHackerOne Affected before 3.0.1 Fixed in 3.0.1 Patch available CNA
- merge-deep (npm) Vendor— Affected before 3.0.1 Fixed in 3.0.1 Patch available GHSA-9g9w-hmvj-5h57
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:merge-deep_project:merge-deep:*:*:*:*:*:node.js:*:* | before 3.0.1 | Vulnerable | Merge-deep Project |
- cpe:2.3:a:merge-deep_project:merge-deep:*:*:*:*:*:node.js:*:* Versions before 3.0.1 Vulnerable ·Merge-deep Project
Remediation
- Fix · CNA merge-deep node module (HackerOne) Fixed in 3.0.1
- Fix · GHSA-9g9w-hmvj-5h57 merge-deep (npm) Fixed in 3.0.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2018-3722
- 2026-10-03 Alias added: GHSA-9g9w-hmvj-5h57
References
More Merge-deep Project Merge-deep vulnerabilities
- TI-2021-08386 The merge-deep library before 3.0.3 for Node.js can be tricked into overwriting… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2018-3722 · CVE Program
- CVE-2018-3722 · NVD
- FIRST EPSS
- GHSA-9g9w-hmvj-5h57 · GitHub Advisory Database · CC BY 4.0
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