Automattic Mongoose up to 6.13.8/7.8.8/8.22.0/9.1.5 hasDollarKeys nor injection

Summaryinfo

A vulnerability labeled as critical has been found in Automattic Mongoose up to 6.13.8/7.8.8/8.22.0/9.1.5. This affects the function hasDollarKeys. The manipulation of the argument nor results in injection. This vulnerability is cataloged as CVE-2026-42334. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, was found in Automattic Mongoose up to 6.13.8/7.8.8/8.22.0/9.1.5. Affected is the function hasDollarKeys. The manipulation of the argument nor with an unknown input leads to a injection vulnerability. CWE is classifying the issue as CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-42334 since 04/26/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1055 by the MITRE ATT&CK project.

Upgrading to version 6.13.9 eliminates this vulnerability.

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Productinfo

Vendor

• Automattic

Name

• Mongoose

Version

• 6.13.0
• 6.13.1
• 6.13.2
• 6.13.3
• 6.13.4
• 6.13.5
• 6.13.6
• 6.13.7
• 6.13.8
• 7.8.0
• 7.8.1
• 7.8.2
• 7.8.3
• 7.8.4
• 7.8.5
• 7.8.6
• 7.8.7
• 7.8.8
• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5
• 8.6
• 8.7
• 8.8
• 8.9
• 8.10
• 8.11
• 8.12
• 8.13
• 8.14
• 8.15
• 8.16
• 8.17
• 8.18
• 8.19
• 8.20
• 8.21
• 8.22.0
• 9.1.0
• 9.1.1
• 9.1.2
• 9.1.3
• 9.1.4
• 9.1.5

Website

• Product: https://github.com/Automattic/mongoose/

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