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.
History

Thu, 10 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 10 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
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.
Title Heap buffer overflow via wrapped size check during SASL username canonicalization in MongoDB C Driver
Weaknesses CWE-190
References
Metrics cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 5.7, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published: 2026-09-10T18:07:10.823Z

Updated: 2026-09-10T18:29:53.256Z

Reserved: 2026-09-09T19:49:53.808Z

Link: CVE-2026-88035

cve-icon Vulnrichment

Updated: 2026-09-10T18:29:45.428Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-10T19:17:40.953

Modified: 2026-09-10T19:44:21.980

Link: CVE-2026-88035

cve-icon Redhat

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