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CVE-2026-18687— Improper Validation in MongoDB Queryable Encryption Maintenance Operation Leads to Denial of Service and Index Corruption

CVSS 7.1 · High EPSS 0.17% · P7

Affected Version Matrix 2

VendorProductVersion RangeStatus
MongoDBMongoDB Server8.3.0< 8.3.8affected
8.0< 8.0.29affected
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I. Basic Information for CVE-2026-18687

Vulnerability Information
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Vulnerability Title
Improper Validation in MongoDB Queryable Encryption Maintenance Operation Leads to Denial of Service and Index Corruption
Source: CVE Program / CVE List V5
Vulnerability Description
MongoDB Server's handling of a Queryable Encryption maintenance operation did not properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privileges could submit a specially formed request that leads to a server crash or excessive internal writes, resulting in resource exhaustion and corruption of encrypted index data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 数字错误漏洞
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 8.3.0至8.3.8之前版本和8.0至8.0.29之前版本存在数字错误漏洞，该漏洞源于对可查询加密维护操作的处理未能在使用前根据集合的加密字段配置正确验证请求参数，可能导致具有读写权限的认证用户提交特制请求，造成服务器崩溃或过多内部写入，从而导致资源耗尽和加密索引数据损坏。
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

VendorProductAffected VersionsCPESubscribe
MongoDBMongoDB Server 8.3.0 ~ 8.3.8 -

II. Public POCs for CVE-2026-18687

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III. Intelligence Information for CVE-2026-18687

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Patches & Fixes for CVE-2026-18687 (1)

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

CVE-2026-186918.8 HIGHImproper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
CVE-2026-186928.8 HIGHUse-After-Free in MongoDB Timeseries Bucket Handling Leads to Denial of Service and Potent
CVE-2026-187128.1 HIGHImproper Authorization in MongoDB Queryable Encryption Maintenance Operations Allows Unaut
CVE-2026-186908.1 HIGHImproper Authorization in MongoDB Server Allows Unauthorized Actions on System Collections
CVE-2026-186937.6 HIGHOut-of-Bounds Read/Write in MongoDB Timeseries Bucket Handling Leads to Denial of Service
CVE-2026-186977.5 HIGHImproper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial o
CVE-2026-186947.1 HIGHOut-of-Bounds Read in MongoDB Geospatial Query Processing Leads to Denial of Service and P
CVE-2026-187117.1 HIGHUse-After-Free in MongoDB Query Execution Engine Leads to Denial of Service and Potential
CVE-2026-186887.1 HIGHOut-of-Bounds Read in MongoDB Aggregation Framework Leads to Denial of Service and Potenti
CVE-2026-187066.6 MEDIUMUse-After-Free in MongoDB $graphLookup Aggregation Stage Leads to Denial of Service and Po
CVE-2026-187056.5 MEDIUMImproper Authorization in MongoDB Atlas Vector Search Allows Unauthorized Access to Protec
CVE-2026-187106.5 MEDIUMCleartext Storage of Sensitive Information in MongoDB Driver Logging During Client Initial
CVE-2026-186996.5 MEDIUMImproper Input Validation in MongoDB Query Planner Leads to Denial of Service
CVE-2026-186966.5 MEDIUMImproper Authorization in MongoDB applyOps Command Handling Allows Unauthorized DDL Operat
CVE-2026-187016.5 MEDIUMType Confusion in MongoDB Query Subsystem Leads to Denial of Service
CVE-2026-187046.5 MEDIUMImproper Authorization in MongoDB Aggregation Framework Allows Read-Only User to Perform U
CVE-2026-187006.5 MEDIUMUse-After-Free in MongoDB Geospatial Validation Leads to Denial of Service
CVE-2026-186956.5 MEDIUMImproper Input Validation in MongoDB Timeseries Query Processing Leads to Denial of Servic
CVE-2026-187096.4 MEDIUMMissing Authorization in MongoDB Sharded Transaction Commit/Abort Handling Leads to Cross-
CVE-2026-187086.4 MEDIUMImproper Neutralization of Input in MongoDB Server's JavaScript Scripting Engine Leads to

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-191

V. Comments for CVE-2026-18687

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