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CVE-2026-9748— $_internalConvertBucketIndexStats may crash the mongod server when working on no timeseries input

CVSS 6.5 · Medium EPSS 0.32% · P24

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< 8.0.10affected
7.0.0< 7.0.35affected
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I. Basic Information for CVE-2026-9748

Vulnerability Information
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Vulnerability Title
$_internalConvertBucketIndexStats may crash the mongod server when working on no timeseries input
Source: NVD (National Vulnerability Database)
Vulnerability Description
The $_internalConvertBucketIndexStats stage used PauseExecution as a way to signal "skip this document" when an index stats conversion failed. But PauseExecution is not a general purpose skip mechanism, but rather a TeeBuffer-internal signal used solely by $facet to coordinate its sub-pipelines. When this stage is placed before $facet in a pipeline, TeeBuffer receives the unexpected PauseExecution from upstream and hits a hard invariant assertion, crashing mongod.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
可达断言
Source: NVD (National Vulnerability Database)
Vulnerability Title
MongoDB Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server存在安全漏洞，该漏洞源于$_internalConvertBucketIndexStats阶段使用PauseExecution作为跳过文档的信号，但该信号被$facet的TeeBuffer错误处理，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-2026-9748

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III. Intelligence Information for CVE-2026-9748

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Patches & Fixes for CVE-2026-9748 (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-2026-97476.5 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-2026-9748

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