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CVE-2026-18697— Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial of Service on mongos

Quick assessment

Affected
MongoDB 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公司开源的一款面向文档的数据库系统。 MongoDB Server 8.3.8版本之前的8.3.x版本、8.0.29版本之前的8.0.x版本和7.0.40版本之前的7.0.x版本存在异常处理不当漏洞，该漏洞源于聚合框架问题，可能导致未经身份验证的攻击者提交特制的聚合命令使mongos（路由器）进程意外终止，造成拒绝服务。

CVSS 7.5 · High EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 3

VendorProduct Version RangeStatus
MongoDB MongoDB Server 8.3.0< 8.3.8 affected
8.0< 8.0.29 affected
7.0< 7.0.40 affected
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I. Basic Information for CVE-2026-18697

Vulnerability Information
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Vulnerability Title
Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial of Service on mongos
Source: CVE Program / CVE List V5
Vulnerability Description
An issue in MongoDB Server's aggregation framework could allow an unauthenticated party to cause a mongos (router) process to terminate unexpectedly by submitting a specially formed aggregation command. This could result in a denial of service, disrupting client connections routed through the affected mongos instance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司开源的一款面向文档的数据库系统。 MongoDB Server 8.3.8版本之前的8.3.x版本、8.0.29版本之前的8.0.x版本和7.0.40版本之前的7.0.x版本存在异常处理不当漏洞，该漏洞源于聚合框架问题，可能导致未经身份验证的攻击者提交特制的聚合命令使mongos（路由器）进程意外终止，造成拒绝服务。
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 MongoDB Server 8.3.0 ~ 8.3.8 -

II. Public POCs for CVE-2026-18697

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III. Intelligence Information for CVE-2026-18697

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Patches & Fixes for CVE-2026-18697 (1)

Same Patch Batch · MongoDB · 2026-08-11 · 25 CVEs total

CVE-2026-18692 8.8 HIGH Use-After-Free in MongoDB Timeseries Bucket Handling Leads to Denial of Service and Potent
CVE-2026-18691 8.8 HIGH Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
CVE-2026-18690 8.1 HIGH Improper Authorization in MongoDB Server Allows Unauthorized Actions on System Collections
CVE-2026-18712 8.1 HIGH Improper Authorization in MongoDB Queryable Encryption Maintenance Operations Allows Unaut
CVE-2026-18693 7.6 HIGH Out-of-Bounds Read/Write in MongoDB Timeseries Bucket Handling Leads to Denial of Service
CVE-2026-18687 7.1 HIGH Improper Validation in MongoDB Queryable Encryption Maintenance Operation Leads to Denial
CVE-2026-18694 7.1 HIGH Out-of-Bounds Read in MongoDB Geospatial Query Processing Leads to Denial of Service and P
CVE-2026-18711 7.1 HIGH Use-After-Free in MongoDB Query Execution Engine Leads to Denial of Service and Potential
CVE-2026-18688 7.1 HIGH Out-of-Bounds Read in MongoDB Aggregation Framework Leads to Denial of Service and Potenti
CVE-2026-18706 6.6 MEDIUM Use-After-Free in MongoDB $graphLookup Aggregation Stage Leads to Denial of Service and Po
CVE-2026-18700 6.5 MEDIUM Use-After-Free in MongoDB Geospatial Validation Leads to Denial of Service
CVE-2026-18704 6.5 MEDIUM Improper Authorization in MongoDB Aggregation Framework Allows Read-Only User to Perform U
CVE-2026-18701 6.5 MEDIUM Type Confusion in MongoDB Query Subsystem Leads to Denial of Service
CVE-2026-18705 6.5 MEDIUM Improper Authorization in MongoDB Atlas Vector Search Allows Unauthorized Access to Protec
CVE-2026-18696 6.5 MEDIUM Improper Authorization in MongoDB applyOps Command Handling Allows Unauthorized DDL Operat
CVE-2026-18695 6.5 MEDIUM Improper Input Validation in MongoDB Timeseries Query Processing Leads to Denial of Servic
CVE-2026-18699 6.5 MEDIUM Improper Input Validation in MongoDB Query Planner Leads to Denial of Service
CVE-2026-18710 6.5 MEDIUM Cleartext Storage of Sensitive Information in MongoDB Driver Logging During Client Initial
CVE-2026-18709 6.4 MEDIUM Missing Authorization in MongoDB Sharded Transaction Commit/Abort Handling Leads to Cross-
CVE-2026-18702 6.4 MEDIUM Improper Authorization in MongoDB profile Command Allows Unauthorized Modification of Serv

Showing top 20 of 25 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: MongoDB Server
Same vendor: MongoDB
Same weakness: CWE-617

V. Comments for CVE-2026-18697

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