How severe is CVE-2026-9742?

CVE-2026-9742 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-9742 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-9742?

CVE-2026-9742 affects Mongodb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-9742?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-9742 have an EU (EUVD) identifier?

Yes. CVE-2026-9742 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35860.

When was CVE-2026-9742 published?

CVE-2026-9742 was published on 2026-06-09 and last updated on 2026-06-18.

CVE-2026-9742

CVE-2026-9742 is a high-severity vulnerability in Mongodb with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1287.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.2
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35860
Weakness: CWE-1287
Affected product: Mongodb
Published: 2026-06-09
Last modified: 2026-06-18

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.

Frequently asked questions

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.
How severe is CVE-2026-9742?: CVE-2026-9742 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-9742 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-9742?: CVE-2026-9742 affects Mongodb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-9742?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-9742 have an EU (EUVD) identifier?: Yes. CVE-2026-9742 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35860.
When was CVE-2026-9742 published?: CVE-2026-9742 was published on 2026-06-09 and last updated on 2026-06-18.

References

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

Affected products (1)

cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:*

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