MongoDBDatabase / datastore
CVE-2019-2393
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 · uneditedA user authorized to perform database queries may trigger denial of service by issuing specially crafted queries, which use $lookup and collations. This issue affects MongoDB Server v4.2 versions prior to 4.2.1; MongoDB Server v4.0 versions prior to 4.0.13 and MongoDB Server v3.6 versions prior to 3.6.15.
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 user with database query privileges can trigger denial of service by issuing specially crafted aggregation queries that combine the $lookup stage with collations. The malformed queries cause excessive resource consumption or crashes in MongoDB Server.
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
>= 3.6.0, < 3.6.15>= 4.0.0, < 4.0.13>= 4.2.0, < 4.2.1CVSS 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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Check installed MongoDB versionRun 'db.version()' in the mongo shell or use 'mongod --version' from command lineAffected if Version is 3.6.0 to 3.6.14, 4.0.0 to 4.0.12, or 4.2.0
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Verify MongoDB authentication is enabledCheck configuration file (typically /etc/mongod.conf) for 'security: authorization: enabled' setting or run 'db.runCommand({connectionStatus: 1})' to see auth statusAffected if Authentication is disabled, meaning any user with network access could trigger the vulnerability
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Identify aggregation pipelines using $lookup with collationsReview application code and database logs for aggregation queries containing both $lookup stage and 'collation' parameter. Use db.getLogParts() or check slow query logs for pattern 'lookup' combined with 'collation'Affected if Aggregation queries using $lookup with custom collations are present in your environment
If your MongoDB version falls within the affected ranges AND authentication is enabled, your environment is potentially vulnerable to DoS through specially crafted $lookup aggregation queries with collations.
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.
From vendor data3.6.154.0.134.2.1
Upgrade MongoDB Server to version 4.2.1 or later, 4.0.13 or later, or 3.6.15 or later to patch this vulnerability.
Fix this in MongoDB
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 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 $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-2393 — 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-2019-2393 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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