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.

Routine

CVSS

5.3

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0041

35th percentile

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

Product	Fixed in	Fix	Released
Windows apps
MongoDB Compass	1.49.6.0	MongoDB Compass 1.49.6.0	May 6, 2026
MongoDB Compass Isolated Edition	1.49.6.0	MongoDB Compass Isolated Edition 1.49.6.0	May 6, 2026
MongoDB Compass Readonly	1.49.6.0	MongoDB Compass Readonly 1.49.6.0	May 6, 2026

Details

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

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