CVE-2026-8201CWE-416

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

Medium · published May 13, 2026

CVSS v4.0
6.1
EPSS
0%
Percentile
11.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:L/SI:N/SA:N
EPSS
0.00218 · 11.6th percentile
Weakness
CWE-416 · Use After Free
Published
2026-05-13T00:12Z
EPSS history
Timeline
  • 13 MAY 00:12Z
    Use-After-Free in MongoDB FLE Query Analysis When Processing Positional Projections on Encrypted Fields
    cvelistv5