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CVE-2026-77482 Microsoft CVE debrief

CVE-2026-77482 is a high-severity vulnerability in Microsoft SQL Server caused by a heap-based buffer overflow, allowing an unauthorized attacker to execute code over a network with a CVSS score of 8.8. Defenders responsible for SQL Server instances, network administrators, and security teams should be aware of this vulnerability and prioritize patching. The vulnerability's impact includes remote code execution, allowing attackers to gain unauthorized access to sensitive data and systems, and successful exploitation could lead to data breaches, system compromise, and lateral movement within the network. To mitigate this vulnerability, defenders need to verify and apply vendor-prov.

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 instances, network administrators, and security teams should be aware of this vulnerability and prioritize patching.

Why it matters

CVE-2026-77482 is a high-severity vulnerability in Microsoft SQL Server that allows remote code execution. Defenders should prioritize patching vulnerable instances to prevent exploitation.

  • Remote code execution is possible, allowing attackers to gain unauthorized access to sensitive data and systems.
  • Successful exploitation could lead to data breaches, system compromise, and lateral movement within the network.
  • Defenders need to verify and apply vendor-provided security updates to prevent exploitation.
  • Patching vulnerable SQL Server instances is crucial to prevent remote code execution.

Technical summary

The vulnerability is caused by a heap-based buffer overflow in Microsoft SQL Server, which allows an unauthorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.8 and is classified as high-severity. Affected product deployments should be confirmed in managed environments, and owners should be assigned for follow-up. The official advisory or CVE record should be reviewed to validate affected scope, severity, and vendor guidance. Vendor-supported updates or mitigations should be planned through normal change control where exposure

Defensive priority

Defenders should prioritize patching this vulnerability as it allows for remote code execution.

Recommended defensive actions

  • Patch vulnerable SQL Server instances
  • Verify and apply vendor-provided security updates
  • Monitor network traffic for suspicious activity
  • Restrict access to sensitive data and systems

Evidence notes

The vulnerability is described in the NVD vulnerability detail page and the CVE Program record. Microsoft has also provided a vendor advisory and patch for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77482 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77482

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

  • CVE-2026-77482 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77482

    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.