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

Quick assessment

Affected
MongoDB, Inc. MongoDB Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server 7.0.34之前版本、8.0.23之前版本、8.2.9之前版本和8.3.2之前版本存在资源管理错误漏洞，该漏洞源于字段级加密查询分析组件中存在释放后重用，可能导致客户端使用mongocryptd和crypt_shared时受影响。

CVSS 6.4 · Medium EPSS 0.22% · P11

Affected Version Matrix 4

VendorProduct Version RangeStatus
MongoDB, Inc. MongoDB Server 7.0< 7.0.34 affected
8.0< 8.0.23 affected
8.2< 8.2.9 affected
8.3< 8.3.2 affected
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I. Basic Information for CVE-2026-8201

Vulnerability Information
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Vulnerability Title
Use-After-Free in MongoDB FLE Query Analysis When Processing Positional Projections on Encrypted Fields
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server 7.0.34之前版本、8.0.23之前版本、8.2.9之前版本和8.3.2之前版本存在资源管理错误漏洞，该漏洞源于字段级加密查询分析组件中存在释放后重用，可能导致客户端使用mongocryptd和crypt_shared时受影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB, Inc. MongoDB Server 7.0 ~ 7.0.34 -

II. Public POCs for CVE-2026-8201

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III. Intelligence Information for CVE-2026-8201

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Patches & Fixes for CVE-2026-8201 (1)

Same Patch Batch · MongoDB, Inc. · 2026-05-13 · 5 CVEs total

CVE-2026-8336 7.5 HIGH Post-authentication use-after-free error in $_internalJsEmit and mapreduce commands
CVE-2026-8199 6.5 MEDIUM Post-auth memory exhaustion via bitwise match expressions
CVE-2026-8202 4.3 MEDIUM Post-authentication CPU utilization DoS via $trim/$ltrim/$rtrim operators
CVE-2026-8200 2.7 LOW Schema validation log messages may not redact user data

IV. Related Vulnerabilities

Same product: MongoDB Server
Same vendor: MongoDB, Inc.
Same weakness: CWE-416

V. Comments for CVE-2026-8201

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