Security readout for executives and security teams
Plain-English summary
CVE-2018-3723 affects the npm defaults-deep module before 0.2.4. A crafted input can alter shared JavaScript object behavior, potentially causing unexpected properties to appear across objects. Business risk depends on whether vulnerable versions process untrusted input in production applications.
Executive priority
Treat as dependency hygiene with targeted urgency. Patch affected applications, especially internet-facing Node.js services that process user-supplied structured input. Absence of KEV or CVSS reduces emergency pressure but does not remove risk.
Technical view
The issue is CWE-471, Modification of Assumed-Immutable Data, commonly associated with prototype pollution. defaults-deep before 0.2.4 allowed modification of Object prototype via __proto__, making added or changed properties visible on all objects in affected runtime contexts.
Likely exposure
Exposure is likely limited to Node.js applications or build tooling that include defaults-deep before 0.2.4, directly or transitively. Risk rises when the module merges attacker-controlled objects or configuration data.
Exploitation context
The source bundle does not show KEV listing, public active exploitation, CVSS scoring, or broad exploitation evidence. The HackerOne report and upstream commit support the vulnerability and remediation context.
Researcher notes
Evidence supports a prototype pollution class issue in defaults-deep before 0.2.4. No exploit status, CVSS vector, or full affected dependency graph is provided, so validation should focus on real package presence and reachable merge flows.
Mitigation direction
- Upgrade defaults-deep to 0.2.4 or later where present.
- Review transitive dependency paths that pull in vulnerable defaults-deep versions.
- Avoid merging untrusted object data without validation.
- Check vendor and package-maintainer guidance for application-specific handling.
Validation and detection
- Search SBOMs, lockfiles, and dependency manifests for defaults-deep before 0.2.4.
- Identify application paths that merge user-controlled objects or configuration data.
- Confirm deployed artifacts no longer include vulnerable defaults-deep versions.
- Add regression coverage for prototype-pollution-safe object merging where applicable.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-471: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2018-3723 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/jonschlinkert/defaults-deep/commit/c873f341327ad885ff4d0f23b3d3bca31b0343e5CVE reference · x_refsource_MISC
- https://hackerone.com/reports/310514CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Modification of Assumed-Immutable Data (MAID)
Modification of Assumed-Immutable Data (MAID) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.