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CVE PROGRAM SOURCE RECORD5.7 Medium

CVE-2026-88035

Heap buffer overflow via wrapped size check during SASL username canonicalization in MongoDB C Driver

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

MongoDB C Driver

Default version status: unaffected

  • 2.2.0 to < 2.5.3affected

References