How severe is CVE-2026-40370?

CVE-2026-40370 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40370 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40370?

CVE-2026-40370 primarily affects Microsoft Sql Server 2016. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-40370?

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-2026-40370 have an EU (EUVD) identifier?

Yes. CVE-2026-40370 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29652.

When was CVE-2026-40370 published?

CVE-2026-40370 was published on 2026-05-12 and last updated on 2026-06-18.

CVE-2026-40370

CVE-2026-40370 is a high-severity vulnerability in Microsoft Sql Server 2016 with a CVSS 3.x base score of 8.8. 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-610.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (42nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29652
Weakness: CWE-610
Affected product: Microsoft Sql Server 2016
Published: 2026-05-12
Last modified: 2026-06-18

Description

External control of file name or path in SQL Server allows an authorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-40370?: External control of file name or path in SQL Server allows an authorized attacker to execute code over a network.
How severe is CVE-2026-40370?: CVE-2026-40370 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40370 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40370?: CVE-2026-40370 primarily affects Microsoft Sql Server 2016. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-40370?: 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-2026-40370 have an EU (EUVD) identifier?: Yes. CVE-2026-40370 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29652.
When was CVE-2026-40370 published?: CVE-2026-40370 was published on 2026-05-12 and last updated on 2026-06-18.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40370

Affected products (5)

cpe:2.3:a:microsoft:sql_server_2016:*:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server_2017:*:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server_2019:*:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server_2022:*:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server_2025:*:*:*:*:*:*:x64:*

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