Use After Free in MongoDB
CVE-2026-8201
A use-after-free vulnerability exists in MongoDB's Field-Level Encryption (FLE) query analysis component, affecting client-side uses of mongocryptd and crypt_shared. Triggering this vulnerability requires control over the structure of a client's FLE-related query. This issue impacts MongoDB Server’s mongocryptd component v7.0 versions prior to 7.0.34, v8.0 versions prior to 8.0.23, v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H.
EPSS exploit prediction
EPSS: 0.002 (11.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- MongoDB
- MongoDB, Inc. MongoDB Server — versions 7.0, 8.0, 8.2
Weakness classification (CWE)
References
- jira.mongodb.org/browse/SERVER-122032 (issue-tracking, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-8201?
- CVE-2026-8201 is a medium-severity vulnerability in MongoDB, classified under Use After Free. CVSS score: 6.4/10. Published 2026-05-13.
- How severe is CVE-2026-8201?
- Medium severity. CVSS v3 base score is 6.4 out of 10.