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CVE-2026-18693— Out-of-Bounds Read/Write in MongoDB Timeseries Bucket Handling Leads to Denial of Service and Potential Memory Disclosure

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 8.3.0版本至8.3.8之前版本、8.0版本至8.0.29之前版本和7.0版本至7.0.40之前版本存在缓冲区错误漏洞，该漏洞源于MongoDB Server处理时间序列集合时，具有写权限的已认证用户通过特定文档插入导致内部数据结构不一致，进而访问预期内存边界之外的内存，可能导致服务器崩溃（拒绝服务）、暴露有限内存内容或内存损坏。

CVSS 7.6 · High EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-18693

Vulnerability Information
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Vulnerability Title
Out-of-Bounds Read/Write in MongoDB Timeseries Bucket Handling Leads to Denial of Service and Potential Memory Disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
An issue in MongoDB Server's handling of timeseries collections could allow an authenticated user with write privileges to cause an internal data structure to become inconsistent through certain document insertions. A subsequent insert into the affected bucket could then result in the server accessing memory outside its intended bounds, potentially causing a server crash (denial of service), exposure of limited memory contents, or memory corruption.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 缓冲区错误漏洞
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版本至8.3.8之前版本、8.0版本至8.0.29之前版本和7.0版本至7.0.40之前版本存在缓冲区错误漏洞，该漏洞源于MongoDB Server处理时间序列集合时，具有写权限的已认证用户通过特定文档插入导致内部数据结构不一致，进而访问预期内存边界之外的内存，可能导致服务器崩溃（拒绝服务）、暴露有限内存内容或内存损坏。
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

Vendor Product Affected Versions CPE Subscribe
MongoDB MongoDB Server 8.3.0 ~ 8.3.8 -

II. Public POCs for CVE-2026-18693

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III. Intelligence Information for CVE-2026-18693

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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-2026-18697 7.5 HIGH Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial o
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-787

V. Comments for CVE-2026-18693

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