# CVE-2026-75159: MongoDB BI Connector Improper Memory Handling During Failed Kerberos Authentication May Cause Process Termination

> An unauthenticated attacker can crash the MongoDB BI Connector process by triggering a specific Kerberos authentication error, causing service disruption.

- **Severity:** High 8.2 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Aug 2026
- **Updated:** 27 Aug 2026
- **Also known as:** GHSA-wwh3-vv7v-5w28

## What is CVE-2026-75159?

CVE-2026-75159 is a high-severity denial of service vulnerability in MongoDB BI Connector, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An unauthenticated client that can reach a MongoDB Connector for BI deployment configured with Kerberos authentication may cause mongosqld to terminate when a crafted authentication exchange encounters a specific GSSAPI error-handling condition. This can interrupt BI Connector availability until the process restarts.

Weakness: CWE-415 (Double Free)

## Which versions are affected by CVE-2026-75159?

It affects 1 product.


Products: Mongodb Bi Connector.

## How do I fix CVE-2026-75159?

No fix has been published for CVE-2026-75159 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-75159 being exploited?

There is no known exploitation of CVE-2026-75159 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-2026-81490](https://insights.sbomify.com/CVE-2026-81490/): MongoDB Connector for BI Improper Error Handling During Schema Sampling May Cause Loss of SQL Service (high 8.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-75159 and fix it if it is affected.

What it is: CVE-2026-75159 is a high-severity denial of service vulnerability in MongoDB BI Connector, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-75159 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-2026-75159/ (Markdown: https://insights.sbomify.com/CVE-2026-75159/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-75159
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-75159
- OSV: https://osv.dev/vulnerability/CVE-2026-75159

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-75159/
Summaries are generated and may contain mistakes; the official description above is the record.