CVE-2026-81490 MongoDB Connector for BI Improper Error Handling During Schema Sampling May Cause Loss of SQL Service
A malicious database user can cause the MongoDB BI Connector to stop serving SQL queries by creating a view that fails during schema sampling.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81490?
CVE-2026-81490 is a high-severity denial of service vulnerability in MongoDB BI Connector, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A database user able to create a view in a namespace that MongoDB Connector for BI samples can cause the schema-sampling routine to stop functioning by defining a view whose evaluation reliably fails. The sampling logic classifies the resulting server message as transient and, after the configured retries are exhausted, proceeds without a valid result, ending the schema refresh routine. The mongosqld process continues running without a usable schema, so SQL clients are unable to obtain results until an operator removes the view or excludes its namespace from sampling.
Weakness: CWE-476
Which versions are affected by CVE-2026-81490?
It affects 1 product.
Products include Mongodb Bi Connector.
How do I fix CVE-2026-81490?
No fix has been published for CVE-2026-81490 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-81490 being exploited?
There is no known exploitation of CVE-2026-81490 in the wild and no public exploit code.
Other vulnerabilities in MongoDB BI Connector
- CVE-2026-81517 MongoDB Connector for BI Improper Error Handling of Log Write Failures May Cause Loss of SQL Service
- CVE-2026-81518 BI Connector Optional Client Certificate Verification Allows Unauthenticated Connections
- CVE-2026-81520 MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaustion
- CVE-2026-77586 MongoDB Connector for BI Unescaped Object Names in Generated SHOW CREATE Output
- CVE-2026-75159 MongoDB BI Connector Improper Memory Handling During Failed Kerberos Authentication May Cause Process Termination
Sources
Also known as GHSA-g954-97w2-99wv.