Prototype pollution in HackerOne assign-deep node module
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 3.1 · NVD. Fix status from CNA and GitHub.
Summary
assign-deep node module before 0.4.7 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 0.01988 80th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed assign-deep node module (HackerOne): 0.4.7assign-deep (npm): 0.4.7
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 | assign-deep node module | before 0.4.7 | 0.4.7 | Patch available | CNA |
| — | assign-deep (npm) | before 0.4.7 | 0.4.7 | Patch available | GHSA-xcvv-84j5-jw9h |
- assign-deep node module VendorHackerOne Affected before 0.4.7 Fixed in 0.4.7 Patch available CNA
- assign-deep (npm) Vendor— Affected before 0.4.7 Fixed in 0.4.7 Patch available GHSA-xcvv-84j5-jw9h
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:assign-deep_project:assign-deep:*:*:*:*:*:node.js:*:* | before 0.4.7 | Vulnerable | Assign-deep Project |
- cpe:2.3:a:assign-deep_project:assign-deep:*:*:*:*:*:node.js:*:* Versions before 0.4.7 Vulnerable ·Assign-deep Project
Remediation
- Fix · CNA assign-deep node module (HackerOne) Fixed in 0.4.7
- Fix · GHSA-xcvv-84j5-jw9h assign-deep (npm) Fixed in 0.4.7 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2018-3720
- 2026-10-03 Alias added: GHSA-xcvv-84j5-jw9h
References
More Assign-deep Project Assign-deep vulnerabilities
- TI-2019-08010 Prototype pollution in assign-deep CVSS 3.1HIGH 7.5
Sources
- CVE-2018-3720 · CVE Program
- CVE-2018-3720 · NVD
- FIRST EPSS
- GHSA-xcvv-84j5-jw9h · GitHub Advisory Database · CC BY 4.0
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