Vulnerability-Lookup

GHSA-C8XX-JPR5-7M25

Vulnerability from github – Published: 2026-07-21 06:31 – Updated: 2026-07-21 06:31

Details

Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in util.js. An attacker can modify the JavaScript prototype chain by supplying a crafted property path containing special keys such as proto.

Severity

4.0 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

6.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-16266"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-21T06:16:28Z",
    "severity": "MODERATE"
  },
  "details": "Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in util.js. An attacker can modify the JavaScript prototype chain by supplying a crafted property path containing special keys such as __proto__.",
  "id": "GHSA-c8xx-jpr5-7m25",
  "modified": "2026-07-21T06:31:18Z",
  "published": "2026-07-21T06:31:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16266"
    },
    {
      "type": "WEB",
      "url": "https://github.com/longshotlabs/mongo-object/issues/27"
    },
    {
      "type": "WEB",
      "url": "https://github.com/longshotlabs/mongo-object/commit/638314107d8b397e5453c28e41729522b3e8d67c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/longshotlabs/mongo-object/blob/4f7a570f2a2fcfa9417b7870d5f859e9574ec73c/src/util.ts%23L251"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-MONGOOBJECT-13816714"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-16266 (GCVE-0-2026-16266)

Vulnerability from cvelistv5 – Published: 2026-07-21 05:00 – Updated: 2026-07-21 14:52

Summary

Severity

4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1321 - Prototype Pollution

Assigner

snyk

References

4 references

URL	Tags
https://security.snyk.io/vuln/SNYK-JS-MONGOOBJECT…
https://github.com/longshotlabs/mongo-object/issues/27
https://github.com/longshotlabs/mongo-object/blob…
https://github.com/longshotlabs/mongo-object/comm…

Impacted products

1 product

Vendor	Product	Version
n/a	mongo-object	Affected: 0 , < 3.0.3 (semver)

Credits

Dezhen Kong

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-16266",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-21T14:41:50.967466Z",
                "version": "2.0.3"
              },
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            "tags": [
              "exploit"
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            "url": "https://github.com/longshotlabs/mongo-object/issues/27"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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        {
          "product": "mongo-object",
          "vendor": "n/a",
          "versions": [
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            }
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          "value": "Dezhen Kong"
        }
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          "value": "Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in util.js. An attacker can modify the JavaScript prototype chain by supplying a crafted property path containing special keys such as __proto__."
        }
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      "metrics": [
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            "confidentialityImpact": "NONE",
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            "scope": "CHANGED",
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            "version": "4.0",
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            "vulnIntegrityImpact": "LOW"
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    "datePublished": "2026-07-21T05:00:00.647Z",
    "dateReserved": "2026-07-20T08:55:21.686Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-C8XX-JPR5-7M25

CVE-2026-16266 (GCVE-0-2026-16266)

Tags

Sightings

Nomenclature