Vulnerability in MongoDB 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 crash (via a division-by-zero) or silently leak process memory contents (via an out-of-bounds read).
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (21.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- MongoDB C Driver
- MongoDB, Inc. C Driver — versions 1.0, 2.0
Weakness classification (CWE)
References
- jira.mongodb.org/browse/CDRIVER-6281 (issue-tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-9100?
- CVE-2026-9100 is a medium-severity vulnerability in MongoDB 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.