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.

How to fix CVE-2026-42334

To remediate CVE-2026-42334, upgrade the affected package to a fixed version below.

• —upgrade to 6.13.9 or later
• —upgrade to 6.13.9 or later

Is CVE-2026-42334 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 6.13.9, >= 7.0.0, < 9.2.0
• from 0, < 6.13.9

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-42334
• PATCHgithub.com/Automattic/mongoose
• WEBgithub.com/Automattic/mongoose/security/advisories/GHSA-wpg9-53fq-2r8h
• WEBmongoosejs.com/docs/api/mongoose.html#Mongoose.prototype.sanitizeFilter()