CVE-2026-114649— Authentication bypass via issuer-and-serial-only certificate equality in shared cluster cache
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驱动在判断两个客户端是否可以共享缓存连接时，仅依据 TLS 客户端证书的颁发者（issuer）和序列号（serial number）进行比较。在由不同用户提供证书来创建客户端的应用程序中，若某用户提交了一个伪造的证书（该证书复制了另一用户的颁发者和序列号，但并未掌握该用户的私钥），则可能被分配已使用另一用户证书进行身份验证的连接。随后，数据库操作将以该另一用户的身份执行，从而影响该用户身份可访问数据的机密性和完整性。
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I. Basic Information for CVE-2026-114649
Vulnerability Information
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Vulnerability Title
Authentication bypass via issuer-and-serial-only certificate equality in shared cluster cache
Source: CVE Program / CVE List V5
Vulnerability Description
The MongoDB C# Driver compares TLS client certificates by issuer and serial number only when deciding whether two clients can share cached connections. In an application that creates clients from certificates supplied by different users, a user who provides a certificate copying another user's issuer and serial number, without that user's private key, can be given connections authenticated with the other user's certificate. Database operations can then run under the other user's identity, affecting the confidentiality and integrity of data that identity can access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用错误要素进行比较
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-114649
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-114649 (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-2026-114652 | 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 |
| CVE-2026-114651 | 4.0 MEDIUM | Cross-document data leak via malformed BSON array parsing in reused thread buffer |
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-2026-114651
Cross-document data leak via malformed BSON array parsing in -
CVE-2026-114650
Plaintext exposure of encrypted fields via ANSI code-page co
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-2026-114651
Cross-document data leak via malformed BSON array parsing in
Same weakness: CWE-1025
V. Comments for CVE-2026-114649
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