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.

INFO

Published Date :

2026-05-06T15:08:23.671Z

Last Modified :

2026-05-07T03:55:47.410Z

Source :

mongodb
AFFECTED PRODUCTS

The following products are affected by CVE-2026-6691 vulnerability.

Vendors Products
Mongodb
  • C Driver
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-6691.

URL Resource
https://jira.mongodb.org/browse/CDRIVER-6134 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact