Bug 2477534 (CVE-2026-42334)

Summary: CVE-2026-42334 mongoose: Mongoose: Information disclosure via sanitizeFilter bypass using $nor operator
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Mongoose, a MongoDB object modeling tool. A remote attacker could bypass the sanitizeFilter query sanitization mechanism by injecting malicious operators, such as $ne, $gt, or $regex, within a $nor clause. This vulnerability arises because the $nor operator was not properly included in the recursive sanitization process. Successful exploitation could lead to information disclosure.
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Description OSIDB Bzimport 2026-05-14 19:01:48 UTC 
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.