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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 Driver是美国MongoDB公司开源的一款C语言数据库驱动。 MongoDB C Driver 2.2.0版本至2.5.3之前版本存在数字错误漏洞，该漏洞源于客户端身份验证路径中的大小检查存在整数环绕，导致异常大的用户名被接受并复制到小缓冲区末尾之外，可能造成嵌入该驱动的应用程序意外终止。

CVSS 4.7 · Medium EPSS 0.10% · P1 Updated Sep 11, 2026

Possible ATT&CK Techniques 2 AI

T1071.001 · Web Protocols T1071.002 · File Transfer Protocols

Affected Version Matrix 1

Vendor	Product	Version Range	Status
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

Vulnerability Title

MongoDB C Driver 数字错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-88035

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-88035

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Other References for CVE-2026-88035 (1)

🔗 [CDRIVER-6416] Check size during SASL username canonicalization - MongoDB Jira

https://www.cve.org/CVERecord?id=CVE-2026-88035

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