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CVE-2026-9747— Crafted cross-shard merge aggregation crashes MongoDB Server

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存在安全漏洞，该漏洞源于添加fromRouter:true和runtimeConstants.userRoles可能导致聚合操作使服务器崩溃。

CVSS 6.5 · Medium EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 4

VendorProduct Version RangeStatus
MongoDB MongoDB Server 8.3.0< 8.3.3 affected
8.2.0< 8.2.10 affected
8.0.0< 8.0.24 affected
7.0.0< 7.0.35 affected
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I. Basic Information for CVE-2026-9747

Vulnerability Information
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Vulnerability Title
Crafted cross-shard merge aggregation crashes MongoDB Server
Source: CVE Program / CVE List V5
Vulnerability Description
Adding fromRouter:true and runtimeConstants.userRoles could cause aggregations to crash mongodb server.
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
Vulnerability Title
MongoDB Server 安全漏洞
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存在安全漏洞，该漏洞源于添加fromRouter:true和runtimeConstants.userRoles可能导致聚合操作使服务器崩溃。
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 ~ 8.3.3 -

II. Public POCs for CVE-2026-9747

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III. Intelligence Information for CVE-2026-9747

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Patches & Fixes for CVE-2026-9747 (1)

Same Patch Batch · MongoDB · 2026-06-09 · 14 CVEs total

CVE-2026-9753 8.1 HIGH Server crash via malformed binary diff passed to $_internalApplyOplogUpdate.
CVE-2026-9740 7.5 HIGH Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow
CVE-2026-9742 7.5 HIGH Authenticate command with specific mechanism parameter can trigger server crash
CVE-2026-9750 6.5 MEDIUM Metadata name collision on $-prefixed fields causes post-auth server crash
CVE-2026-9748 6.5 MEDIUM $_internalConvertBucketIndexStats may crash the mongod server when working on no timeserie
CVE-2026-9741 6.5 MEDIUM Client side encryption fails to encrypt values in a $vectorSearch
CVE-2026-9749 6.5 MEDIUM Using MaxKey() may crash the server
CVE-2026-9752 6.5 MEDIUM GeometryCollection with strict-winding polygon causes server crash during 2dsphere index k
CVE-2026-9746 6.5 MEDIUM Server crashes in case of the use of exchange
CVE-2026-9743 6.5 MEDIUM Aggregation sub-pipeline null dereference may allow DoS via crafted getMore
CVE-2026-9754 6.5 MEDIUM Stack memory disclosure in filemd5 command
CVE-2026-9751 5.5 MEDIUM Sensitive data could be written to mongod.log
CVE-2026-9735 5.5 MEDIUM Keyfile contents are in MongoDB Server logs

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-9747

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