# 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.

- **Severity:** High 8.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Aug 2026
- **Updated:** 31 Aug 2026
- **Also known as:** GHSA-g954-97w2-99wv

## 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 (NULL Pointer Dereference)

## Which versions are affected by CVE-2026-81490?

It affects 1 product.


Products: 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.

## 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](https://insights.sbomify.com/CVE-2026-81517/): MongoDB Connector for BI Improper Error Handling of Log Write Failures May Cause Loss of SQL Service (high 8.7)
- [CVE-2026-81518](https://insights.sbomify.com/CVE-2026-81518/): BI Connector Optional Client Certificate Verification Allows Unauthenticated Connections (high 8.7)
- [CVE-2026-81520](https://insights.sbomify.com/CVE-2026-81520/): MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaustion (high 8.7)
- [CVE-2026-77586](https://insights.sbomify.com/CVE-2026-77586/): MongoDB Connector for BI Unescaped Object Names in Generated SHOW CREATE Output (high 8.5)
- [CVE-2026-75159](https://insights.sbomify.com/CVE-2026-75159/): MongoDB BI Connector Improper Memory Handling During Failed Kerberos Authentication May Cause Process Termination (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-81490 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-81490 in the wild and no public exploit code.

Affected product: MongoDB BI Connector. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-81490/ (Markdown: https://insights.sbomify.com/CVE-2026-81490/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-81490
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-81490
- OSV: https://osv.dev/vulnerability/CVE-2026-81490

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-81490/
Summaries are generated and may contain mistakes; the official description above is the record.