CVE-2026-6691

CVE-2026-6691CVE-2026-6691

mongodb / c_driver

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.

Scoring

CVSS 7.8 ()
VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Last modified2026-06-18
Sourced from NVD. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.