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No exploitation reportedFix available

CVE-2018-3719

No exploitation reported by the sources we read.

  • Published2018-06-07
  • Fixed in1.3.1
  • WeaknessCWE-20 · CWE-471

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

mixin-deep node module before 1.3.1 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.

Timeline

dates in UTC
  1. 2018-06-0702:29CVE publishedNVD

Versions per branch

NVD · OSV
Mixin-deep project mixin-deep
BranchAffectedFixed in
1.3< 1.3.11.3.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • node-mixin-deepUbuntu:26.10all versions · no fixed version listed
  • node-mixin-deepUbuntu:26.04:LTSall versions · no fixed version listed
  • node-mixin-deepUbuntu:25.10all versions · no fixed version listed
  • node-mixin-deepUbuntu:24.04:LTSall versions · no fixed version listed
  • node-mixin-deepUbuntu:22.04:LTSall versions · no fixed version listed
  • node-mixin-deepUbuntu:20.04:LTSall versions · no fixed version listed
  • node-mixin-deepUbuntu:18.04:LTSall versions · no fixed version listed
  • node-mixin-deepDebian:14all versions · fixed in 1.1.3-2

2 more package ranges on OSV.dev

Vendor advisories

  • CVE-2018-3719 Red Hat Product Security

    nodejs-mixin-deep: Prototype pollution via merging functions

Full record on NVD

Fix

  1. Update Mixin-deep project mixin-deep to 1.3.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.06.5read 2026-10-23
  • CNAweakness (CWE)CWE-471known since 2026-10-23
  • NVDweakness (CWE)CWE-20read 2026-10-23
  • FIRST EPSSEPSS score2.1 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2020-06-16

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2018-06-07
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-3mpr-hq3p-49h9

Frequently asked questions

What is CVE-2018-3719?

mixin-deep node module before 1.3.1 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.

Is CVE-2018-3719 actively exploited?

Active exploitation of CVE-2018-3719 has not been confirmed. Its EPSS score was 2.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-3719?

CVE-2018-3719 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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