CVE-2026-88035 — Heap buffer overflow via wrapped size check during SASL username canonicalization in MongoDB C Driver
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…
Published: 2026-09-10 · CVSS: 5.7 · CVSS 4.0
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 · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7