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CVE-2026-104005— Incorrect authorization in MongoDB Server router for bulk writes to system namespaces

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 mongos（分片集群路由器）中发现了一个安全问题。具有读写权限的已认证用户可以通过构造特制的聚合管道，导致 mongos 进程崩溃。该漏洞利用了内部聚合阶段缺乏适当授权检查的问题，尽管该阶段设计为仅供内部使用，但攻击者可以迫使后续阶段在路由节点上以非预期条件执行，从而引发未处理的致命错误，导致 mongos 进程立即终止，造成所有通过受影响 mongos 实例路由的客户端无法访问，形成拒绝服务（DoS）攻击。

CVSS 6.5 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
MongoDB MongoDB Server 8.3.0< 8.3.13 affected
9.0< 9.0.4 affected
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I. Basic Information for CVE-2026-104005

Vulnerability Information
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Vulnerability Title
Incorrect authorization in MongoDB Server router for bulk writes to system namespaces
Source: CVE Program / CVE List V5
Vulnerability Description
A security issue was discovered in MongoDB mongos (the sharded cluster router) where an authenticated user with readWrite privileges could crash the mongos process by crafting a specially formed aggregation pipeline. The issue leverages an internal aggregation stage that lacks proper authorization checks despite being intended for internal use, allowing a subsequent stage to be forced to execute on the router under conditions it was not designed to handle. This results in an unhandled fatal error that causes the mongos process to immediately abort, resulting in denial of service for all clients routed through the affected mongos instance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB MongoDB Server 8.3.0 ~ 8.3.13 -

II. Public POCs for CVE-2026-104005

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III. Intelligence Information for CVE-2026-104005

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Other References for CVE-2026-104005 (1)

Same Patch Batch · MongoDB · 2026-10-13 · 5 CVEs total

CVE-2026-96297 6.5 MEDIUM MongoDB Server may disclose process memory via a crafted `$_internalApplyOplogUpdate` aggr
CVE-2026-96299 6.5 MEDIUM Missing Authorization Check on Internal Aggregation Stage in MongoDB Server mongos Leads t
CVE-2026-104004 6.5 MEDIUM Collection validators using collation-accepting expressions can crash MongoDB Server on in
CVE-2026-103965 5.4 MEDIUM Fixed values in MongoDB Server $bucket stage may be misread as field references

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-104005

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