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CVE-2026-9746— Server crashes in case of the use of exchange

CVSS 6.5 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

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-2026-9746

Vulnerability Information
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Vulnerability Title
Server crashes in case of the use of exchange
Source: NVD (National Vulnerability Database)
Vulnerability Description
When using $changestreams and $_requestReshardingResumeToken with the exchange option the server hits an invariant which causes the server to crash. There are no special privileges needed. The user must be logged in to issue the statement.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
可达断言
Source: NVD (National Vulnerability Database)
Vulnerability Title
MongoDB Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server存在安全漏洞，该漏洞源于使用$changestreams和$_requestReshardingResumeToken并启用exchange选项时触发不变条件，可能导致服务器崩溃。
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

VendorProductAffected VersionsCPESubscribe
MongoDBMongoDB Server 8.3.0 ~ 8.3.3 -

II. Public POCs for CVE-2026-9746

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III. Intelligence Information for CVE-2026-9746

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Patches & Fixes for CVE-2026-9746 (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-2026-97506.5 MEDIUMMetadata name collision on $-prefixed fields causes post-auth server crash
CVE-2026-97486.5 MEDIUM$_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-2026-97436.5 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-2026-9746

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