CVE-2026-9742

Authenticate command with specific mechanism parameter can trigger server crash

CVE-2026-9742 is fixed in MongoDB on 1 platform by MongoDB 8.3.3 (version 8.3.3), released May 28, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.2

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0035

28th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
MongoDB	8.3.3	MongoDB 8.3.3	May 28, 2026

Details

Published
June 9, 2026
Weakness
CWE-1287: Improper validation of specified type of input
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-9742

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