CVE-2026-2303: MongoDB Inc MongoDB Go Driver

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

The mongo-go-driver repository contains CGo bindings for GSSAPI (Kerberos) authentication on Linux and macOS. The C wrapper implementation contains a heap out-of-bounds read vulnerability due to incorrect assumptions about string termination in the GSSAPI standard. Since GSSAPI buffers are not guaranteed to be null-terminated or have extra padding, this results in reading one byte past the allocated heap buffer.

Affected products

• MongoDB Inc MongoDB Go Driver: from 1.0.0, before 1.17.7 (fixed in 1.17.7); from 2.0.0, before 2.4.2 (fixed in 2.4.2)

Published 2026-02-10. Last modified 2026-06-17.