CVE-2026-88035
Heap buffer overflow via wrapped size check during SASL username canonicalization in MongoDB C Driver
CVSS Score
4.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-190 |
| Vendor | mongodb |
| Product | c driver |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 10, 2026 |
| Last Updated | Sep 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
MongoDB / C Driver
2.2.0 < 2.5.3