CVE-2026-9742

Authenticate command with specific mechanism parameter can trigger server crash

MEDIUM
5.9
CVSS Score
Published: June 9, 2026 at 09:57 PM UTC
Updated: July 23, 2026 at 07:32 PM UTC
1 product affected across 1 vendorMongoDB

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

8.2.0 ≤ v < 8.2.108.3.0 ≤ v < 8.3.38.2.08.3.0
Affected range stops below 8.2.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.3.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

PatchVendor AdvisoryIssue Tracking
Source: cverecord
https://jira.mongodb.org/browse/SERVER-124183

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1287

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