What is CVE-2026-9101?

CVE-2026-9101 is a medium-severity vulnerability in MongoDB Compass, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 4.3/10. Published 2026-05-20.

How severe is CVE-2026-9101?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Prototype Pollution in MongoDB Compass

CVE-2026-9101

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.

Vulnerability class: Prototype Pollution

Published 2026-05-20 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (36.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000

Affected products

MongoDB Compass — versions 1.36.3, 1.36.4, 1.37.0
MongoDB, Inc. Compass — versions 1.36.3, 1.36.4, 1.37.0

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

jira.mongodb.org/browse/COMPASS-10657 (issue-tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-9101?: CVE-2026-9101 is a medium-severity vulnerability in MongoDB Compass, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 4.3/10. Published 2026-05-20.
How severe is CVE-2026-9101?: Medium severity. CVSS v3 base score is 4.3 out of 10.