CVE-2026-6691
HIGH
NVD
CVSS Score
7.8
Severity
HIGH
Published
May 06, 2026
Vendor
unknown
Description
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.