CVE-2026-6691

High

Open

TLP:CLEAR

NVD CVE.org

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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.

Details

CVSS Score: 7.8
EPSS Score ⓘ: 0.13%

2.7th percentile
CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Confidence: 90%
Published: May 6, 2026

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