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CVE-2026-8336— Post-authentication use-after-free error in $_internalJsEmit and mapreduce commands

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$_internalJsEmit或mapreduce命令的map函数调用方式不当，可能导致认证用户在特定方式下使用服务器端JavaScript引擎时崩溃mongod，造成认证后拒绝服务。

CVSS 7.5 · High EPSS 0.47% · P39

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
MongoDB, Inc. MongoDB Server 8.2< 8.2.9 affected
8.3< 8.3.2 affected
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I. Basic Information for CVE-2026-8336

Vulnerability Information
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Vulnerability Title
Post-authentication use-after-free error in $_internalJsEmit and mapreduce commands
Source: CVE Program / CVE List V5
Vulnerability Description
After invoking $_internalJsEmit, which is not intended to be directly accessible, or mapreduce command’s map function in a certain way, an authenticated user can subsequently crash mongod when the server-side JavaScript engine (through $where, $function, mapreduce reduce stage, etc.) is used also in a specific way, resulting in a post-authentication denial-of-service. This issue impacts MongoDB Server v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server 7.0.34之前版本、8.0.23之前版本、8.2.9之前版本和8.3.2之前版本存在资源管理错误漏洞，该漏洞源于$_internalJsEmit或mapreduce命令的map函数调用方式不当，可能导致认证用户在特定方式下使用服务器端JavaScript引擎时崩溃mongod，造成认证后拒绝服务。
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 8.2 ~ 8.2.9 -

II. Public POCs for CVE-2026-8336

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III. Intelligence Information for CVE-2026-8336

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Vendor Pages for CVE-2026-8336 (1)

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

CVE-2026-8199 6.5 MEDIUM Post-auth memory exhaustion via bitwise match expressions
CVE-2026-8201 6.4 MEDIUM Use-After-Free in MongoDB FLE Query Analysis When Processing Positional Projections on Enc
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-2026-8336

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