CVE-2026-114645— Heap overflow via 32-bit length wrap of the URI username in Windows Kerberos auth message wrapping
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 驱动程序中仅适用于 Windows 的 Kerberos/SSPI 身份验证代码存在 32 位整数回绕漏洞。当客户端连接配置中提供过长的凭证值时，该漏洞会导致分配一个尺寸不足的堆缓冲区。能够控制该客户端配置且结合受影响身份验证机制的攻击者，可致使驱动程序向已分配缓冲区的边界外写入数据。这可能引发客户端进程内存损坏，并导致客户端应用程序拒绝服务。此问题仅影响使用 Windows 原生身份验证后端编译的客户端版本。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-114645
Vulnerability Information
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Vulnerability Title
Heap overflow via 32-bit length wrap of the URI username in Windows Kerberos auth message wrapping
Source: CVE Program / CVE List V5
Vulnerability Description
A 32-bit integer wraparound in the MongoDB C Driver's Windows-only Kerberos/SSPI authentication code can cause an undersized heap buffer to be allocated when an excessively long credential value is supplied in the client's connection configuration. A party able to control that client-side configuration, in conjunction with the affected authentication mechanism, can cause the driver to write outside the bounds of the allocated buffer. This may result in corruption of client process memory and denial of service of the client application. The issue affects only client builds compiled with the Windows-native authentication backend.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-114645
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Other References for CVE-2026-114645 (4)
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-2026-114647 | 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 |
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V. Comments for CVE-2026-114645
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