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CVE-2026-88035— Heap buffer overflow via wrapped size check during SASL username canonicalization 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.

MongoDB C 驱动在客户端身份验证路径中的大小检查可能发生整数回绕（wrap around）。因此，异常大的用户名值会被接受，并复制到小缓冲区的末尾之外。能够设置驱动连接配置的主体可能会导致嵌入该驱动的应用程序意外终止。要触发此代码路径，需要构建中包含了可选的外部 SASL 身份验证后端，并且连接被配置为使用该后端。

CVSS 4.7 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
MongoDB C Driver 2.2.0< 2.5.3 affected
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I. Basic Information for CVE-2026-88035

Vulnerability Information
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Vulnerability Title
Heap buffer overflow via wrapped size check during SASL username canonicalization in MongoDB C Driver
Source: CVE Program / CVE List V5
Vulnerability Description
A size check in the client-side authentication path of the MongoDB C Driver can wrap around, so an unusually large user-name value is accepted and copied past the end of a small buffer. A party able to set the driver's connection settings may cause the application that embeds the driver to terminate unexpectedly. Reaching this code requires a build in which the optional external SASL authentication backend is present and a connection configured to use it.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/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

Vendor Product Affected Versions CPE Subscribe
MongoDB C Driver 2.2.0 ~ 2.5.3 -

II. Public POCs for CVE-2026-88035

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III. Intelligence Information for CVE-2026-88035

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Other References for CVE-2026-88035 (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-2026-88026 6.5 MEDIUM Regular expression injection via unescaped characters in LINQ query translation in MongoDB
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

IV. Related Vulnerabilities

Same product: C Driver
Same vendor: MongoDB
Same weakness: CWE-190

V. Comments for CVE-2026-88035

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