High severity7.8NVD Advisory· Published May 6, 2026· Updated May 7, 2026
CVE-2026-6691
CVE-2026-6691
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.
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Affected products
1Patches
Vulnerability mechanics
References
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