Authenticate command with specific mechanism parameter can trigger server crash
CVE-2026-9742

8.2HIGH

Key Information:

Vendor

Mongodb
Status
Mongodb Server
Vendor
CVE Published:
9 June 2026

What is CVE-2026-9742?

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.

Affected Version(s)

MongoDB Server 8.3.0 < 8.3.3

MongoDB Server 8.2.0 < 8.2.10

References

https://jira.mongodb.org/browse/SERVER-124183

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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