CVE-2026-81518 — HIGH (7.5)

Vulnerability Description

When mongosqld is configured with a client certificate authority file, the listener requests a client certificate during the TLS handshake but does not require one, so a client that presents no certificate is still accepted. In deployments that rely on client certificates as the sole means of identifying users, a remote party with network access to the listener can therefore establish a session and read the MongoDB data exposed through the connector.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Related Weaknesses (CWE)

CWE-295

References

https://www.mongodb.com/docs/bi-connector/current/release-notes/

FAQ

What is CVE-2026-81518?

CVE-2026-81518 is a vulnerability with a CVSS score of 7.5 (HIGH). When mongosqld is configured with a client certificate authority file, the listener requests a client certificate during the TLS handshake but does not require one, so a client that presents no certif...

How severe is CVE-2026-81518?

CVE-2026-81518 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-81518?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.