Authenticated denial of service via exponential query hashing
Published Jul 22, 2026 · Updated Jul 22, 2026
Denial of service in affected MongoDB Server 8.x releases allows remote authenticated users to exhaust CPU via nested $jsonSchema queries. MatchExpressionHashVisitor rehashes each InternalSchema subtree while its outer tree walker is already descending it, doubling work at every nesting level and making query-plan hashing exponential. Read access to a collection is sufficient; the CPU-bound planning thread ignores killOp() because plan enumeration lacks interrupt checks, causing prolonged latency or service interruption.
Summary
What happened
Denial of service in affected MongoDB Server 8.x releases allows remote authenticated users to exhaust CPU via nested $jsonSchema queries. MatchExpressionHashVisitor rehashes each InternalSchema subtree while its outer tree walker is already descending it, doubling work at every nesting level and making query-plan hashing exponential. Read access to a collection is sufficient; the CPU-bound planning thread ignores killOp() because plan enumeration lacks interrupt checks, causing prolonged latency or service interruption.
The record
- CVE
- CVE-2026-13064
- Published
- Jul 22, 2026
- Updated
- Jul 22, 2026
- Vendor
- MongoDB
- Product
- MongoDB Server
- Classifications
- CWE-407, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 22, 2026CVE publishedPublication date reported by the CVE source.
- Jul 22, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=8.0 <8.0.28
- Affected versionversion=8.2.0 <8.2.12
- Affected versionversion=8.3.0 <8.3.7
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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