High severity · published May 13, 2026
CVE-2026-8201
Use-After-Free in MongoDB FLE Query Analysis When Processing Positional Projections on Encrypted Fields
8.8
CVSS
0.1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
7.0.0 before 7.0.34; 8.0.0 before 8.0.23; 8.2.0 before 8.2.9; 8.3.0 before 8.3.2 · source: NVD
MS
MongoDB Server · MongoDB, Inc.
7.0 before 7.0.34; 8.0 before 8.0.23; 8.2 before 8.2.9; 8.3 before 8.3.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8201
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8201
Issue Tracking
https://jira.mongodb.org/browse/SERVER-122032
More from MongoDB
9.9
CVE-2019-10758
MongoDB mongo-express Remote Code Execution Vulnerability
7.5
CVE-2025-14847
Zlib compressed protocol header length confusion may allow memory read
9.8
CVE-2026-19001
MongoDB BI Connector ODBC driver may write outside an allocated buffer when handling oversized catalog object names
9.8
CVE-2025-40906
BSON::XS versions 0.8.4 and earlier for Perl includes a bundled libbson 1.1.7, which has several vulnerabilities
9.8
CVE-2025-3085
MongoDB Server running on Linux may allow unexpected connections where intermediate certificates are revoked