CVE-2026-9748— $_internalConvertBucketIndexStats may crash the mongod server when working on no timeseries input
Quick assessment
Affected
MongoDB MongoDB Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server存在安全漏洞，该漏洞源于$_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。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MongoDB | MongoDB Server | 8.3.0< 8.3.3 |
affected |
8.2.0< 8.2.10 |
affected | ||
8.0.0< 8.0.10 |
affected | ||
7.0.0< 7.0.35 |
affected |
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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: CVE Program / CVE List V5
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 $facet in a pipeline, TeeBuffer receives the unexpected PauseExecution from upstream and hits a hard invariant assertion, crashing mongod.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB Server是美国MongoDB公司的一套开源的NoSQL数据库。该数据库提供面向集合的存储、动态查询、数据复制及自动故障转移等功能。 MongoDB Server存在安全漏洞，该漏洞源于$_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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MongoDB | MongoDB Server | 8.3.0 ~ 8.3.3 | - |
|
II. Public POCs for CVE-2026-9748
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-9748 (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-2026-9747 | 6.5 MEDIUM | Crafted cross-shard merge aggregation crashes MongoDB Server |
| 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 |
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