CVE-2026-8201— Use-After-Free in MongoDB FLE Query Analysis When Processing Positional Projections on Encrypted Fields
Possible ATT&CK Techniques 2AI
T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://jira.mongodb.org/browse/SERVER-122032issue-tracking
- https://nvd.nist.gov/vuln/detail/CVE-2026-8201
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
- CVE-2026-8843
Calling createIndex with certain index types can crash mongo - CVE-2026-8202
Post-authentication CPU utilization DoS via $trim/$ltrim/$rt - CVE-2026-8336
Post-authentication use-after-free error in $_internalJsEmit - CVE-2026-8200
Schema validation log messages may not redact user data - CVE-2026-8199
Post-auth memory exhaustion via bitwise match expressions
Same vendor: MongoDB, Inc.
- CVE-2026-8843
Calling createIndex with certain index types can crash mongo - CVE-2026-8202
Post-authentication CPU utilization DoS via $trim/$ltrim/$rt - CVE-2026-8336
Post-authentication use-after-free error in $_internalJsEmit - CVE-2026-8200
Schema validation log messages may not redact user data - CVE-2026-8199
Post-auth memory exhaustion via bitwise match expressions
Same weakness: CWE-416
- CVE-2026-28733
filemanagement_storage_service has an use after free vulnera - CVE-2026-8746
Open5GS NRF nghttp2-server.c discover_handler use after free - CVE-2026-8696
radare2 6.1.5 Use-After-Free via gdbr_pids_list() - CVE-2026-8695
radare2 6.1.5 Use-After-Free via gdbr_threads_list() - CVE-2025-48521
ASP PCI驱动Use-After-Free漏洞致平台完整性丧失
V. Comments for CVE-2026-8201
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