CVE-2026-8201 PUBLISHED

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

Assigner: mongodb
Reserved: 08.05.2026 Published: 13.05.2026 Updated: 13.05.2026

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:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:L/SI:N/SA:N
CVSS Score: 6.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	Low
Attack Complexity	High	Integrity	Low	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
CVSS Score: 6.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	MongoDB, Inc.
Product	MongoDB Server
Versions	Default: unaffected affected from 7.0 to 7.0.34 (excl.) affected from 8.0 to 8.0.23 (excl.) affected from 8.2 to 8.2.9 (excl.) affected from 8.3 to 8.3.2 (excl.)

References

https://jira.mongodb.org/browse/SERVER-122032

Problem Types

CWE-416: Use After Free CWE