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CVE-2019-20149

Status: ModifiedHigh (7.5)—PoC
Severity7.5High · CVSS 3.1
Exploitation probability2.34 %higher than 83% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailableProof of concept on GitHub (unverified)

ctorName in index.js in kind-of v6.0.2 allows external user input to overwrite certain internal attributes via a conflicting name, as demonstrated by 'constructor': {'name':'Symbol'}. Hence, a crafted payload can overwrite this builtin attribute to manipulate the type detection result.

CVSS

Base score
7.5
Version
3.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
2.34 %
Percentile among all scored CVEs
83
Score date
10/22/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Kind-of Project — Kind-of

CWEs

References

Show 4 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2019-20149",
  "cveTags": [],
  "metrics": {
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          "authentication": "NONE",
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        "acInsufInfo": false,
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      "tags": [
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-668"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "ctorName in index.js in kind-of v6.0.2 allows external user input to overwrite certain internal attributes via a conflicting name, as demonstrated by 'constructor': {'name':'Symbol'}. Hence, a crafted payload can overwrite this builtin attribute to manipulate the type detection result."
    },
    {
      "lang": "es",
      "value": "La función ctorName en el archivo index.js en kind-of versión v6.0.2, permite que la entrada de un usuario externo sobrescriba ciertos atributos internos por medio de un nombre en conflicto, como es demostrado por 'constructor':{'name':'Symbol'}. Por lo tanto, una carga útil especialmente diseñada puede sobrescribir este atributo incorporado para manipular el resultado de detección de tipo."
    }
  ],
  "lastModified": "2026-06-17T02:30:00.723",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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  "sourceIdentifier": "cve@mitre.org"
}