Mongoose's Improper Sanitization of $nor in sanitizeFilter May Allow NoSQL Injection
Impact
This 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 may lead to:
- Authentication bypass
- Unauthorized data access
- Data exfiltration
Affected users:
Applications that:
- Explicitly enable sanitizeFilter
- Pass unsanitized user-controlled input directly into query methods (e.g.,
Model.findOne(req.body)) and rely onsanitizeFilterto strip out query selectors
Applications that validate input schemas, whitelist fields, or avoid passing raw request bodies into queries are not affected. For example, Model.findOne({ user: req.body.user, pwd: req.body.pwd }) is not affected.
Patches
Patches have been released for all supported Mongoose release lines:
^6.13.9^7.8.9^8.22.1^9.1.6
Workarounds
Delete $nor keys, use an additional schema validation library, or write middleware to strip out $nor from query filters.
Resources
sanitizeFilter documentation: https://mongoosejs.com/docs/api/mongoose.html#Mongoose.prototype.sanitizeFilter()
Original blog post on sanitizeFilter: https://thecodebarbarian.com/whats-new-in-mongoose-6-sanitizefilter.html
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | mongoose | < 6.13.9, >= 7.0.0, < 7.8.9, >= 8.0.0, < 8.22.1, >= 9.0.0, < 9.1.6 | 6.13.9, 7.8.9, 8.22.1, 9.1.6 |
Referencias
- https://github.com/Automattic/mongoose/security/advisories/GHSA-wpg9-53fq-2r8h
- https://nvd.nist.gov/vuln/detail/CVE-2026-42334
- https://github.com/Automattic/mongoose
- https://mongoosejs.com/docs/api/mongoose.html#Mongoose.prototype.sanitizeFilter()
- https://thecodebarbarian.com/whats-new-in-mongoose-6-sanitizefilter.html
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- Debilidad (CWE)
CWE-74- Plataforma
- npm
- Paquete
mongoose- Publicada
- 05.05.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-wpg9-53fq-2r8h - CC BY 4.0
Historial de vulnerabilidades: mongoose
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 9
- Primera → última
- 10.2019 07.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 4
- Alta 3
- Media 2
Divulgaciones por año
- 2019: 1
- 2020: 1
- 2021: 0
- 2022: 2
- 2023: 1
- 2024: 1
- 2025: 1
- 2026: 2
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Mongoose's Improper Sanitization of $nor in sanitizeFilter May Allow NoSQL Injection esta entrada
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