What is CVE-2026-9100?

CVE-2026-9100 is a medium-severity vulnerability in Mongodb, Inc. C Driver, classified under CWE-1285. CVSS score: 5.9/10. Published 2026-05-20.

How severe is CVE-2026-9100?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Mongodb, Inc. C Driver

CVE-2026-9100

The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate validation. Crafted documents in a GridFS collection may cause any application that reads those files via the legacy API to either…

EPSS: 0.001 (22.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H.

Affected products

Mongodb, Inc. C Driver — versions 1.0, 2.0

Weakness classification (CWE)

CWE-1285

References

cna@mongodb.com (issue-tracking)

Frequently asked questions

What is CVE-2026-9100?: CVE-2026-9100 is a medium-severity vulnerability in Mongodb, Inc. C Driver, classified under CWE-1285. CVSS score: 5.9/10. Published 2026-05-20.
How severe is CVE-2026-9100?: Medium severity. CVSS v3 base score is 5.9 out of 10.