CVE-2026-9742
Received Received - Intake
OIDC Mechanism Parameter Crash Leading to Pre-Auth DoS

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: MongoDB, Inc.

Description
When OIDC authentication is enabled in configuration, clients may set specific values in the "mechanism" parameter of the "authenticate" command that lead to server crash. The authenticate command is accessible to unauthenticated clients, leading to pre-auth denial-of-service in affected product configurations.
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Meta Information
Published
2026-06-09
Last Modified
2026-06-09
Generated
2026-06-10
AI Q&A
2026-06-10
EPSS Evaluated
N/A
NVD
CVE-2026-9742
EUVD
EUVD-2026-35860
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mongodb mongodb *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-1287 The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type.
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Executive Summary

This vulnerability occurs when OpenID Connect (OIDC) authentication is enabled in the configuration of the affected product. Clients can set specific values in the "mechanism" parameter of the "authenticate" command, which can cause the server to crash.

The "authenticate" command is accessible to unauthenticated clients, meaning that anyone can send this command without prior authentication.

As a result, this leads to a denial-of-service (DoS) condition before authentication (pre-auth), disrupting the availability of the server.

Impact Analysis

The primary impact of this vulnerability is a denial-of-service (DoS) attack that can crash the server.

Since the "authenticate" command is accessible without authentication, an attacker can exploit this vulnerability remotely to cause the server to become unavailable.

This can lead to service disruption, affecting availability and potentially causing downtime for users relying on the affected system.

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