Security readout for executives and security teams
Plain-English summary
CVE-2018-3719 affects the mixin-deep Node.js module before 1.3.1. A malicious input could alter shared Object behavior, which may make unrelated application objects inherit unexpected properties. Business impact depends on where the library is used and whether untrusted data reaches merge logic.
Executive priority
Treat as a dependency hygiene issue with potential integrity impact. Prioritize internet-facing Node.js services and systems that process untrusted structured input, but current urgency is limited by absent exploitation and severity evidence in the provided sources.
Technical view
The issue is CWE-471 Modification of Assumed-Immutable Data. Vulnerable mixin-deep versions allow modification of Object.prototype through __proto__, causing added or changed properties to appear across objects. The provided sources name versions before 1.3.1 as affected.
Likely exposure
Exposure is most likely in JavaScript or Node.js applications that depend directly or transitively on mixin-deep before 1.3.1 and merge attacker-controlled object data.
Exploitation context
The provided bundle does not show CVSS, KEV listing, or confirmed active exploitation. Public references include a HackerOne report and a GitHub commit, indicating a known dependency flaw rather than evidence of current exploitation.
Researcher notes
Key validation is reachability: confirm vulnerable mixin-deep is present and reachable from untrusted input paths. Avoid assuming exploitability from dependency presence alone; prototype modification impact depends heavily on application logic and downstream property checks.
Mitigation direction
- Upgrade mixin-deep to version 1.3.1 or later.
- Check transitive dependencies and refresh lockfiles where vulnerable versions remain.
- Review vendor and package advisories for any project-specific guidance.
- Prioritize services that merge user-supplied JSON or request bodies.
Validation and detection
- Inspect package manifests, lockfiles, and SBOMs for mixin-deep before 1.3.1.
- Confirm deployed artifacts no longer include vulnerable versions.
- Review code paths where untrusted objects are recursively merged.
- Run regression tests around object-merging and authorization-sensitive logic.
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-2018-3719 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/mixin-deep/commit/578b0bc5e74e14de9ef4975f504dc698796bdf9cCVE reference · x_refsource_MISC
- https://hackerone.com/reports/311236CVE 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.