# CVE-2026-96747: Forced local Unix socket connection via dot-sock KMS endpoint in client-side field encryption

> An attacker with database write access can force the MongoDB Python Driver to connect to local Unix sockets via malicious KMS endpoints, bypassing network restrictions.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Sep 2026
- **Updated:** 24 Sep 2026
- **Also known as:** AZL-105113, DEBIAN-CVE-2026-96747, ECHO-cab9-823f-652f, GHSA-qx36-8mw2-4r3x, MINI-rmgm-w249-p5rm, PYSEC-2026-4295, UBUNTU-CVE-2026-96747

## What is CVE-2026-96747?

CVE-2026-96747 is a medium-severity server-side request forgery vulnerability in MongoDB Python Driver, published on 24 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The client-side field level encryption support in the MongoDB Python Driver can treat a key management endpoint value ending in ".sock" as a local Unix domain socket path rather than a remote host. A user with write access to the encryption key metadata stored in the database can cause an application using the driver to open connections to local sockets on the application host. Data sent over these connections is limited to the start of a TLS handshake, so no chosen content is transmitted.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-96747?

3 open source packages ship an affected version, including pymongo.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `pymongo` | PyPI | From 3.9.0 | 4.18.2 |
| `pymongo` | PyPI | From 3.9.0 | 4.18.2 |
| `pymongo` | PyPI | From 3.9.0 | 4.18.2 |

## How do I fix CVE-2026-96747?

Upgrade pymongo to 4.18.2 or later.

## Is CVE-2026-96747 being exploited?

There is no known exploitation of CVE-2026-96747 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-96747 and fix it if it is affected.

What it is: CVE-2026-96747 is a medium-severity server-side request forgery vulnerability in MongoDB Python Driver, published on 24 Sep 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-2026-96747 in the wild and no public exploit code.

Affected packages and fixed versions:
- pymongo (PyPI): affected from 3.9.0; fixed in 4.18.2
- pymongo (PyPI): affected from 3.9.0; fixed in 4.18.2
- pymongo (PyPI): affected from 3.9.0; fixed in 4.18.2

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-2026-96747/ (Markdown: https://insights.sbomify.com/CVE-2026-96747/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-96747
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-96747
- OSV: https://osv.dev/vulnerability/CVE-2026-96747

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-96747/
Summaries are generated and may contain mistakes; the official description above is the record.