CVE-2026-42334
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedMongoose 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceMongoose's sanitizeFilter feature fails to recursively sanitize the $nor operator, allowing malicious query operators like $ne, $gt, or $regex to be injected inside $nor clauses without being neutralized. Since $nor accepts an array (like $and/$or) and arrays bypass hasDollarKeys(), attackers can bypass query sanitization.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 6.13.9>= 7.0.0, < 7.8.9>= 8.0.0, < 8.22.1>= 9.0.0, < 9.1.6CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed Mongoose versionRun `npm list mongoose` in your project directory or inspect the version in package.jsonAffected if The version falls within one of these ranges: < 6.13.9, >= 7.0.0 and < 7.8.9, >= 8.0.0 and < 8.22.1, >= 9.0.0 and < 9.1.6
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Verify sanitizeFilter is enabledInspect your Mongoose connection configuration. Look for `sanitizeFilter: true` in the connection options object passed to `mongoose.connect()` or `mongoose.createConnection()`Affected if sanitizeFilter is explicitly set to true in your connection options
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Identify $nor operator usage in queriesSearch your codebase for queries containing the $nor operator, such as `Model.find({ $nor: [...] })` or `Model.findOne({ $nor: [...] })`Affected if Your application uses $nor in any MongoDB queries, particularly with user-supplied or external input
You are affected if you are running a vulnerable Mongoose version, have sanitizeFilter enabled, and your application uses the $nor operator in queries.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped6.13.97.8.98.22.1
Upgrade Mongoose to version 6.13.9, 7.8.9, 8.22.1, or 9.1.6 or later. Ensure sanitizeFilter is enabled in the Mongoose connection options.
Upgrade to the latest patch version in your major version line: 6.13.9 (for 6.x), 7.8.9 (for 7.x), 8.22.1 (for 8.x), or 9.1.6 (for 9.x)
- 1. Identify your current Mongoose version by checking package.json or running `npm list mongoose`
- 2. Determine which major version branch you are on (6.x, 7.x, 8.x, or 9.x)
- 3. For Mongoose 6.x: Upgrade to version 6.13.9 or later by running `npm install [email protected]`
- 4. For Mongoose 7.x: Upgrade to version 7.8.9 or later by running `npm install [email protected]`
- 5. For Mongoose 8.x: Upgrade to version 8.22.1 or later by running `npm install [email protected]`
- 6. For Mongoose 9.x: Upgrade to version 9.1.6 or later by running `npm install [email protected]`
- 7. Run your test suite to verify the application functions correctly after the upgrade
- 8. If using sanitizeFilter, verify that $nor queries are now properly sanitized
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation2.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,840.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-42334 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-42334 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
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