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CVE-2026-54116 Microsoft CVE debrief

A medium-severity vulnerability, CVE-2026-54116, was found in SQL Server. It allows an authorized attacker to disclose information over a network using incompatible type, also known as 'type confusion'. This type of vulnerability can occur when user input is not properly sanitized, allowing an attacker to manipulate the data and potentially access sensitive information. System administrators and security teams should be aware of this vulnerability and take steps to mitigate it.

Vendor
Microsoft
Product
Microsoft SQL Server 2025 (CU 6)
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

System administrators and security teams responsible for SQL Server installations should prioritize patching this vulnerability to prevent potential information disclosure. This includes reviewing and updating SQL Server configurations, monitoring for potential exploitation attempts, and ensuring that all necessary security controls are in place.

Technical summary

CVE-2026-54116 is a type confusion vulnerability in SQL Server that could allow an authorized attacker to disclose information over a network. The vulnerability has a CVSS score of 6.5 and a severity rating of MEDIUM. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. This type of vulnerability can occur when user input is not properly sanitized, allowing an attacker to manipulate the data and potentially access sensitive information.

Defensive priority

Apply patches or mitigations as recommended by the vendor to prevent exploitation. This should be done as soon as possible to minimize the risk of information disclosure.

Recommended defensive actions

  • Apply patches or mitigations as recommended by the vendor
  • Conduct a thorough review of SQL Server installations to ensure they are up-to-date
  • Monitor SQL Server logs for potential exploitation attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:18:07.707Z and was last modified on 2026-07-16T15:16:32.600Z. The NVD entry is currently Awaiting Analysis. The vulnerability has a CVSS score of 6.5 and a severity rating of MEDIUM. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54116 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54116

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-54116 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54116

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.