CVE-2026-88035 — Heap buffer overflow via wrapped size check during SASL username canonicalization in MongoDB C Driver

CVE-2026-88035

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

Description (CNA)

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 (CNA)

Vendor / product	Versions
MongoDB / C Driver	affected 2.2.0 before 2.5.3

CWE

CWE-190

References

https://jira.mongodb.org/browse/CDRIVER-6416

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.