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Vulnerability · Published May 13, 2026 · Assigned by mongodb

CVE-2026-8201Use-After-Free in MongoDB FLE Query Analysis When Processing Positional Projections on Encrypted Fields

Medium 6.4

In plain English

A medium-severity use-after-free in MongoDB Server from MongoDB, Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.1%top 97.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
MongoDB, Inc. MongoDB Server 7.0 – before 7.0.348.0 – before 8.0.238.2 – before 8.2.98.3 – before 8.3.2

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

References