CVE-2026-114651— Cross-document data leak via malformed BSON array parsing in reused thread buffer
Quick assessment
Affected
MongoDB C# Driver
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 C驱动程序中 BSON 反序列化组件存在内存处理缺陷。当解析经过特殊构造的序列化输入时，该缺陷可能导致将之前处理过的内容残留数据返回。任何未经身份验证的攻击者，若能够向应用程序提供序列化数据，且该应用程序映射了某些原始集合类型，则可能使同一执行线程上此前处理的无关数据的残留字节被当作合法值暴露。这可能导致泄露少量属于其他请求或应用程序主体的信息。此漏洞的利用无需任何身份验证或应用程序内的特殊权限。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-114651
Vulnerability Information
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Vulnerability Title
Cross-document data leak via malformed BSON array parsing in reused thread buffer
Source: CVE Program / CVE List V5
Vulnerability Description
A memory-handling weakness in the BSON deserialization component of the MongoDB C# Driver may cause data left over from previously processed content to be returned when specially crafted serialized input is parsed. An unauthenticated party able to supply serialized data to an application that maps certain primitive collection types can cause residual bytes from unrelated data processed earlier on the same execution thread to be surfaced as legitimate values. This can result in disclosure of a limited amount of information belonging to other requests or principals of the consuming application. No authentication or special privileges within the application are required.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-114651
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-114651 (3)
Same Patch Batch · MongoDB · 2026-10-22 · 13 CVEs total
| CVE-2026-114648 | 7.6 HIGH | NoSQL injection via dot and dollar characters in LINQ filter field names and dictionary ke |
| CVE-2026-114649 | 6.8 MEDIUM | Authentication bypass via issuer-and-serial-only certificate equality in shared cluster ca |
| CVE-2026-114652 | 6.5 MEDIUM | Update operator injection via single-element list rewriting in the update builder |
| CVE-2026-114646 | 6.5 MEDIUM | NoSQL command injection via mismatched raw BSON length prefix written verbatim to the wire |
| CVE-2026-114654 | 6.5 MEDIUM | BSON output corruption via out-of-range binary subtype bypassing UUID and OldBinary guards |
| CVE-2026-114653 | 6.5 MEDIUM | Silent client-side encryption bypass via unescaped field-name regex in CSFLE schema builde |
| CVE-2026-114655 | 5.9 MEDIUM | KMS request injection via unsanitized key vault and provider values in libmongocrypt |
| CVE-2026-114650 | 5.9 MEDIUM | Plaintext exposure of encrypted fields via ANSI code-page corruption of database name |
| CVE-2026-114644 | 5.9 MEDIUM | Memory-exhaustion denial of service via unbounded symbol interning during BSON/JSON deseri |
| CVE-2026-114643 | 5.4 MEDIUM | Duplicate geometry fields via unvalidated GeoJSON extra members |
| CVE-2026-114645 | 5.2 MEDIUM | Heap overflow via 32-bit length wrap of the URI username in Windows Kerberos auth message |
| CVE-2026-114647 | 4.3 MEDIUM | NoSQL operator injection via unvalidated replacement document in findOneAndReplace |
IV. Related Vulnerabilities
Same product: C# Driver
-
CVE-2026-114654
BSON output corruption via out-of-range binary subtype bypas -
CVE-2026-114653
Silent client-side encryption bypass via unescaped field-nam -
CVE-2026-114652
Update operator injection via single-element list rewriting -
CVE-2026-114650
Plaintext exposure of encrypted fields via ANSI code-page co -
CVE-2026-114649
Authentication bypass via issuer-and-serial-only certificate
Same vendor: MongoDB
-
CVE-2026-114655
KMS request injection via unsanitized key vault and provider -
CVE-2026-114654
BSON output corruption via out-of-range binary subtype bypas -
CVE-2026-114653
Silent client-side encryption bypass via unescaped field-nam -
CVE-2026-114652
Update operator injection via single-element list rewriting -
CVE-2026-114650
Plaintext exposure of encrypted fields via ANSI code-page co
Same weakness: CWE-908
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CVE-2026-115386
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V. Comments for CVE-2026-114651
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