cvedb.io
CVE-2026-6691
HIGH · CVSS 7.8
EPSS exploitation probability: 0%
Published 2026-05-06T16:16:11.483 · Last modified 2026-06-18T17:18:13.887

Summary

The MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or network traffic. This may be triggered by passing untrusted input in the username of a MongoDB URI with authMechanism=GSSAPI.

Affected products

mongodb — c_driver

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.