CVE-2026-42334

Description

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.9, 7.8.9, 8.22.1, and 9.1.6, a vulnerability allows bypassing Mongoose’s sanitizeFilter query sanitization mechanism via the $nor operator. When sanitizeFilter is enabled, Mongoose wraps query operators in $eq to neutralize them. However, prior to the fix, $nor was not included in the set of logical operators that are recursively sanitized. Because $nor accepts an array (like $and and $or), and arrays do not trigger hasDollarKeys(), malicious operators such as $ne, $gt, or $regex could be injected inside a $nor clause without being sanitized. This vulnerability is fixed in 6.13.9, 7.8.9, 8.22.1, and 9.1.6.

CVSS Details

CVSS Score

7.5

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Mongoose < 6.13.9

Mongoose < 7.8.9

Mongoose < 8.22.1

Mongoose < 9.1.6

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// Example payload demonstrating the bypass of sanitizeFilter using $nor
// The attacker sends a query object containing a $nor operator
// with a nested $ne operator which is intended to be sanitized.

const userQuery = {
  username: "admin",
  $nor: [
    { password: { $ne: "invalid_password" } } // Malicious operator injection
  ]
};

// In vulnerable versions, sanitizeFilter fails to sanitize the $ne inside $nor
// This could potentially be used to infer data or bypass logic checks depending on the query context.

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-42334
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-42334
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-42334/
[4] VulDB https://vuldb.com/cve/CVE-2026-42334
[5] https://github.com/Automattic/mongoose/security/advisories/GHSA-wpg9-53fq-2r8h

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-42334", "sourceIdentifier": "[email protected]", "published": "2026-05-14T18:16:47.747", "lastModified": "2026-05-14T18:26:39.827", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.9, 7.8.9, 8.22.1, and 9.1.6, a vulnerability allows bypassing Mongoose’s sanitizeFilter query sanitization mechanism via the $nor operator. When sanitizeFilter is enabled, Mongoose wraps query operators in $eq to neutralize them. However, prior to the fix, $nor was not included in the set of logical operators that are recursively sanitized. Because $nor accepts an array (like $and and $or), and arrays do not trigger hasDollarKeys(), malicious operators such as $ne, $gt, or $regex could be injected inside a $nor clause without being sanitized. This vulnerability is fixed in 6.13.9, 7.8.9, 8.22.1, and 9.1.6."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-74"}]}], "references": [{"url": "https://github.com/Automattic/mongoose/security/advisories/GHSA-wpg9-53fq-2r8h", "source": "[email protected]"}]}}