What is CVE-2026-75159?

CVE-2026-75159 is a medium-severity vulnerability in MongoDB Bi Connector, classified under Double Free. CVSS score: 5.9/10. Published 2026-08-27.

How severe is CVE-2026-75159?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Double Free in MongoDB Bi Connector

CVE-2026-75159

An unauthenticated client that can reach a MongoDB Connector for BI deployment configured with Kerberos authentication may cause mongosqld to terminate when a crafted authentication exchange encounters a specific GSSAPI error-handling condition. This can interrupt BI Connector availability until the process restarts.

Vulnerability class: Double Free

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Mongodb Bi Connector

Weakness classification (CWE)

CWE-415 — Double Free

References

cna@mongodb.com

Frequently asked questions

What is CVE-2026-75159?: CVE-2026-75159 is a medium-severity vulnerability in MongoDB Bi Connector, classified under Double Free. CVSS score: 5.9/10. Published 2026-08-27.
How severe is CVE-2026-75159?: Medium severity. CVSS v3 base score is 5.9 out of 10.