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CVE-2026-88026— Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver

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.

在 MongoDB C驱动的 LINQ 查询转换组件中，若未正确中和正则表达式元字符，攻击者提供的字符序列可能会改变受影响应用程序生成的正则表达式谓词。能够影响该值的已认证用户可致使应用程序返回超出原始过滤器范围之外的记录。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1592 · Gather Victim Host Information

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB C# Driver 2.14.0≤ 3.11.1 affected
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I. Basic Information for CVE-2026-88026

Vulnerability Information
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Vulnerability Title
Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of regular-expression metacharacters in the LINQ query translation component of the MongoDB C# Driver can cause a caller-supplied character sequence to alter a regular-expression predicate generated by an affected application. An authenticated user who can influence such a value may cause the application to return records beyond those intended by the original filter.
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
数据查询逻辑中特殊元素的不当中和
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB C# Driver 2.14.0 ~ 3.11.1 -

II. Public POCs for CVE-2026-88026

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III. Intelligence Information for CVE-2026-88026

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Other References for CVE-2026-88026 (1)

Same Patch Batch · MongoDB · 2026-09-10 · 15 CVEs total

CVE-2026-88024 8.3 HIGH GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoD
CVE-2026-88023 8.3 HIGH GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoD
CVE-2026-88025 8.3 HIGH GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoD
CVE-2026-88030 8.3 HIGH GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoD
CVE-2026-88029 8.3 HIGH GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoD
CVE-2026-88034 8.3 HIGH GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoD
CVE-2026-88033 8.3 HIGH GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoD
CVE-2026-88036 8.3 HIGH GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoD
CVE-2026-88031 8.1 HIGH GridFS data deletion via query-operator injection in file IDs in the MongoDB Go Driver
CVE-2026-88022 7.7 HIGH Unauthorized document disclosure and deletion via query-operator injection in explicit equ
CVE-2026-88027 7.1 HIGH Mass deletion and overwrite of embedded documents via query-operator injection in embedded
CVE-2026-88028 6.5 MEDIUM Unauthorized document disclosure via query-operator injection in polymorphic relation iden
CVE-2026-88032 5.9 MEDIUM Application denial of service via cancellation race in reactive client-side encryption in
CVE-2026-88035 4.7 MEDIUM Heap buffer overflow via wrapped size check during SASL username canonicalization in Mongo

IV. Related Vulnerabilities

Same product: C# Driver
Same vendor: MongoDB
Same weakness: CWE-943

V. Comments for CVE-2026-88026

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