# CVE-2026-9101: Prototype pollution in csv parsing

> Prototype pollution in CSV parsing allows attackers to execute arbitrary commands via shell.openExternal after specific user interactions.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 20 May 2026
- **Updated:** 27 May 2026
- **Also known as:** GHSA-hwpv-w8h7-v7qm

## What is CVE-2026-9101?

CVE-2026-9101 is a medium-severity code injection vulnerability in MongoDB, Inc. Compass, published on 20 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Prototype pollution in csv parsing logic during import can lead to untrusted file paths (but not arguments) entering shell.openExternal after specific user behavior leading to "1-click" command execution.

Weakness: CWE-1321 (Improperly Controlled Modification of Object Prototype Attributes)

## Which versions are affected by CVE-2026-9101?

It affects 1 product.


Products: Mongodb Compass.

## How do I fix CVE-2026-9101?

No fix has been published for CVE-2026-9101 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-9101 being exploited?

There is no known exploitation of CVE-2026-9101 in the wild and no public exploit code.

## Other vulnerabilities in MongoDB, Inc. Compass

- [CVE-2026-14881](https://insights.sbomify.com/CVE-2026-14881/): Command injection in MongoDB Compass (high 8.4)
- [CVE-2025-1755](https://insights.sbomify.com/CVE-2025-1755/): MongoDB Compass may be susceptible to local privilege escalation in Windows (high 7.5)
- [CVE-2024-3371](https://insights.sbomify.com/CVE-2024-3371/): Insufficient validation of external input in Compass may enable MITM attacks (high 7.1)
- [CVE-2024-6376](https://insights.sbomify.com/CVE-2024-6376/): ejson shell parser in MongoDB Compass maybe bypassed (high 7.0)
- [CVE-2021-20334](https://insights.sbomify.com/CVE-2021-20334/): Local privilege escalation in MongoDB Compass for Windows (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9101 and fix it if it is affected.

What it is: CVE-2026-9101 is a medium-severity code injection vulnerability in MongoDB, Inc. Compass, published on 20 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-9101 in the wild and no public exploit code.

Affected product: MongoDB, Inc. Compass. 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-2026-9101/ (Markdown: https://insights.sbomify.com/CVE-2026-9101/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9101
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9101
- OSV: https://osv.dev/vulnerability/CVE-2026-9101

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-9101/
Summaries are generated and may contain mistakes; the official description above is the record.