CVE-2026-8201

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

State: Published
Severity: 6.1 Medium
Published: May 13, 2026
Updated: May 13, 2026
Reserved: May 8, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.1 Medium	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	mongodb
3.1	6.4 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H	mongodb

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
MongoDB ServerMongoDB, Inc.	7.0 to before 7.0.34Affected 8.0 to before 8.0.23Affected 8.2 to before 8.2.9Affected 8.3 to before 8.3.2Affected

References

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

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