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

CVE-2026-9101 is fixed in 3 products on 1 platform, first by MongoDB Compass 1.49.6.0, released May 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-9101
- Priority: Routine
- CVSS: 5.3
- EPSS: 0.0041
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 20, 2026
- Weakness: CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-9101

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | MongoDB Compass | 1.49.6.0 | [MongoDB Compass 1.49.6.0](https://patchblox.com/security/data/fix/windows-app/mongodb.compass.full-1.49.6.0.md) | May 6, 2026 |
| Windows apps | MongoDB Compass Isolated Edition | 1.49.6.0 | [MongoDB Compass Isolated Edition 1.49.6.0](https://patchblox.com/security/data/fix/windows-app/mongodb.compass.isolated-1.49.6.0.md) | May 6, 2026 |
| Windows apps | MongoDB Compass Readonly | 1.49.6.0 | [MongoDB Compass Readonly 1.49.6.0](https://patchblox.com/security/data/fix/windows-app/mongodb.compass.readonly-1.49.6.0.md) | May 6, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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