CVE-2026-114653— Silent client-side encryption bypass via unescaped field-name regex in CSFLE schema builder
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驱动程序中的客户端加密模式构建组件，会将调用方提供的字段标识符直接置于一个被解释为模式表达式的位置，而未经过规范化或验证。因此，若应用程序指定某些字段进行客户端字段级加密，其保护机制可能在静默状态下失效，导致本应加密的数据以明文形式存储和返回；反之，加密规则也可能比预期应用得更广泛。触发该问题无需任何用户操作，任何拥有普通数据读取权限的方（即使未持有加密密钥）均可观察到未受保护的值。
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I. Basic Information for CVE-2026-114653
Vulnerability Information
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Vulnerability Title
Silent client-side encryption bypass via unescaped field-name regex in CSFLE schema builder
Source: CVE Program / CVE List V5
Vulnerability Description
A client-side encryption schema construction component in the MongoDB C# Driver places caller-supplied field identifiers into a position that is interpreted as a pattern expression, without normalizing or validating them. As a result, an application that designates certain fields for client-side field-level encryption may have the protection silently fail to apply, so data intended to be encrypted is stored and returned in cleartext; conversely, the rule may apply more broadly than intended. No user action is required to cause the condition, and any party with ordinary read access to the stored data — without possession of the encryption keys — can observe the unprotected values.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的正则表达式
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-114653
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Other References for CVE-2026-114653 (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-2026-114655 | 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-2026-114652
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 -
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-2026-114652
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 weakness: CWE-185
-
CVE-2026-111755
follow-redirects sensitiveHeaders regex escaping can expose -
CVE-2026-111057
Mercury: Unauthenticated Remote Code Execution in /api/termi -
CVE-2026-88021
Consul vulnerable to an authorization bypass in the Connect -
CVE-2026-73425
@astrojs/netlify generates an overly-broad Netlify Image CDN -
CVE-2026-64655
GitHub CLI: Attestation Verification Bypass via Unescaped Re
V. Comments for CVE-2026-114653
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