MongoDBDatabase / datastore
CVE-2026-9750
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 · uneditedAn authenticated user can cause a MongoDB server to crash or return incorrect results by creating documents that interfere with internal metadata processing during query execution. This stems from insufficient separation between user-controlled document fields and internal metadata in certain execution paths.
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 confidenceAn authenticated attacker can cause MongoDB server crashes or return corrupted query results by crafting documents whose fields improperly overlap with internal metadata structures during query execution. The vulnerability stems from insufficient boundary enforcement between user-controlled document fields and MongoDB's internal metadata in certain execution paths.
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
MongoDBDatabase / datastore
>= 7.0.0, < 7.0.35>= 8.0.0, < 8.0.24>= 8.2.0, < 8.2.10>= 8.3.0, < 8.3.3CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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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Identify MongoDB server versionRun 'db.version()' in the mongo shell or use 'mongos --version' / 'mongod --version' from command lineAffected if Version falls within >= 7.0.0, < 7.0.35; >= 8.0.0, < 8.0.24; >= 8.2.0, < 8.2.10; or >= 8.3.0, < 8.3.3
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Confirm authentication is in useRun 'db.runCommand({authStatus:1})' in the mongo shell to verify authentication is enabledAffected if Authentication is disabled (unauthenticated users cannot exploit this specific flaw)
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Review user permissions on collectionsRun 'db.runCommand({rolesInfo:1})' or check 'db.getUsers()' to list users and their roles; examine if users have insert/update privileges on collections used in metadata-heavy queriesAffected if Users have insert or update permissions on collections that undergo complex query execution with internal metadata processing
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Inspect for recent server crashes or restartsCheck MongoDB logs (default path /var/log/mongodb/ or /data/log/) for crash reports or 'AssertionException' errors around query execution timestampsAffected if Unexpected server terminations or assertion errors related to document processing are present in logs
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Audit collections for anomalous document structuresQuery targeted collections for documents with unusually deep nesting, excessive fields, or fields using reserved names (typically starting with '$' or '_')Affected if Documents contain suspicious field names or structures that could interfere with internal metadata processing
Environment is affected if MongoDB version is within the vulnerable ranges AND authenticated users have write access to collections used in metadata-heavy 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 · scoped7.0.358.0.248.2.10
Apply the vendor security patch for CVE-2026-9750 to MongoDB servers; review and restrict query permissions to trusted authenticated users until patching is complete.
Upgrade to the latest patch version in your major version branch: 7.0.35+, 8.0.24+, 8.2.10+, or 8.3.3+ (recommended: latest stable 8.0.x or 8.3.x)
- 1. Identify the current MongoDB version by running: db.version() in the mongo shell or checking the mongod logs
- 2. Determine the appropriate target version based on your current major version branch: for 7.0.x upgrade to 7.0.35+, for 8.0.x upgrade to 8.0.24+, for 8.2.x upgrade to 8.2.10+, for 8.3.x upgrade to 8.3.3+
- 3. Take a full backup of all databases using mongodump or the MongoDB Atlas backup feature
- 4. Test the upgrade in a non-production environment first to verify application compatibility
- 5. Schedule a maintenance window and stop the MongoDB cluster
- 6. Upgrade MongoDB packages or Atlas cluster to the appropriate fixed version
- 7. Verify the upgrade was successful by checking: db.version()
- 8. Restart application services and verify query functionality
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in MongoDB
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-9750 — 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-2026-9750 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
No notes yet
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- Version or environment caveats, and links to real fixes
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