mongo-c-driver: A size check in the client-side authentication path of the MongoDB C Driver can wrap around, so an unusually large us...
CVE-2026-88035 is fixed in mongo-c-driver on 1 platform by DEBIAN-CVE-2026-88035 (version 2.5.3-1), released September 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mongo-c-driver · Debian 14 | 2.5.3-1 | DEBIAN-CVE-2026-88035 | Sep 17, 2026 |
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