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CVE-2026-77486 Microsoft CVE debrief

CVE-2026-77486 is an integer overflow or wraparound vulnerability in SQL Server that allows unauthorized code execution over a network. This high-severity issue requires immediate attention from defenders responsible for SQL Server installations. They should assess exposure, apply patches, and monitor network activity to prevent potential code execution. The vulnerability's impact is significant, as it enables attackers to execute code remotely, emphasizing the need for prompt action. Defenders should verify exposure, apply patches for affected versions, and monitor network activity for suspicious attempts. The CVE record and NVD entry provide details on the vulnerability, but its

Vendor
Microsoft
Product
Microsoft SQL Server 2017 (CU 31)
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-15
Advisory published
2026-09-08
Advisory updated
2026-09-15

Who should care

Defenders responsible for SQL Server installations should assess exposure and apply patches to prevent unauthorized code execution. This includes verifying exposure, applying patches for affected versions, and monitoring network activity for suspicious attempts. Additionally, security teams and vulnerability management teams should be aware of this high-severity vulnerability and its potential impact on SQL Server

Why it matters

CVE-2026-77486 is a high-severity vulnerability in SQL Server that allows unauthorized code execution over a network. Defenders should verify exposure, apply patches, and monitor network activity.

  • Potential code execution over a network
  • Verification of SQL Server installations for exposure
  • Application of patches for affected versions
  • Monitoring network activity for suspicious attempts

Technical summary

The CVE-2026-77486 vulnerability is an integer overflow or wraparound issue in SQL Server that allows an unauthorized attacker to execute code over a network. This technical issue arises from improper handling of integer values, leading to potential wraparound or overflow. As a result, attackers can exploit this vulnerability to execute code remotely, emphasizing the need for defenders to prioritize verifying exposure and applying patches for SQL Server installations. The vulnerability's technical details indicate a high-severity issue that requires immediate

Defensive priority

Defenders should prioritize verifying exposure and applying patches for SQL Server installations.

Recommended defensive actions

  • Verify SQL Server installations for exposure
  • Apply patches for affected SQL Server versions
  • Monitor network activity for suspicious code execution attempts

Evidence notes

The CVE record and NVD entry provide details on the integer overflow or wraparound vulnerability in SQL Server, allowing unauthorized code execution over a network.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77486 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77486

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

  • CVE-2026-77486 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77486

    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.