CVE-2026-8336— Post-authentication use-after-free error in $_internalJsEmit and mapreduce commands
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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, $function, mapreduce reduce stage, etc.) is used also in a specific way, resulting in a post-authentication denial-of-service. This issue impacts MongoDB Server v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
Vulnerability Title
MongoDB Server 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server 7.0.34之前版本、8.0.23之前版本、8.2.9之前版本和8.3.2之前版本存在资源管理错误漏洞，该漏洞源于$_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
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://jira.mongodb.org/browse/SERVER-121610issue-tracking
- https://nvd.nist.gov/vuln/detail/CVE-2026-8336
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
- 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-2026-8201
Use-After-Free in MongoDB FLE Query Analysis When Processing - 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-2026-8201
Use-After-Free in MongoDB FLE Query Analysis When Processing - 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-2026-47310
Escargot 590345cc6258317c5da850d846ce6baaf2afc2d3释放后使用漏洞 - 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()
V. Comments for CVE-2026-8336
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