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CVE-2026-9750— Metadata name collision on $-prefixed fields causes post-auth server crash

CVSS 6.5 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 4

VendorProductVersion RangeStatus
MongoDBMongoDB Server8.3.0< 8.3.3affected
8.2.0< 8.2.10affected
8.0.0< 8.0.24affected
7.0.0< 7.0.35affected
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I. Basic Information for CVE-2026-9750

Vulnerability Information
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Vulnerability Title
Metadata name collision on $-prefixed fields causes post-auth server crash
Source: NVD (National Vulnerability Database)
Vulnerability Description
An authenticated user can cause a MongoDB server to crash or return incorrect results by creating documents that interfere with internal metadata processing during query execution. This stems from insufficient separation between user-controlled document fields and internal metadata in certain execution paths.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
可达断言
Source: NVD (National Vulnerability Database)
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，该漏洞源于用户控制的文档字段与内部元数据分离不足，可能导致经过身份验证的用户通过创建干扰查询执行期间内部元数据处理的文档使服务器崩溃或返回错误结果。
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 ~ 8.3.3 -

II. Public POCs for CVE-2026-9750

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III. Intelligence Information for CVE-2026-9750

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Patches & Fixes for CVE-2026-9750 (1)

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

CVE-2026-97538.1 HIGHServer crash via malformed binary diff passed to $_internalApplyOplogUpdate.
CVE-2026-97407.5 HIGHUnbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow
CVE-2026-97427.5 HIGHAuthenticate command with specific mechanism parameter can trigger server crash
CVE-2026-97486.5 MEDIUM$_internalConvertBucketIndexStats may crash the mongod server when working on no timeserie
CVE-2026-97476.5 MEDIUMCrafted cross-shard merge aggregation crashes MongoDB Server
CVE-2026-97416.5 MEDIUMClient side encryption fails to encrypt values in a $vectorSearch
CVE-2026-97496.5 MEDIUMUsing MaxKey() may crash the server
CVE-2026-97526.5 MEDIUMGeometryCollection with strict-winding polygon causes server crash during 2dsphere index k
CVE-2026-97466.5 MEDIUMServer crashes in case of the use of exchange
CVE-2026-97436.5 MEDIUMAggregation sub-pipeline null dereference may allow DoS via crafted getMore
CVE-2026-97546.5 MEDIUMStack memory disclosure in filemd5 command
CVE-2026-97515.5 MEDIUMSensitive data could be written to mongod.log
CVE-2026-97355.5 MEDIUMKeyfile contents are in MongoDB Server logs

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-9750

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