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CVE-2026-62889 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-11T17:18:40.170Z and has not been modified since then. The NVD entry is currently Analyzed. This double-free vulnerability in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over a network, affecting multiple versions of Windows 10, Windows 11, and Windows Server. Microsoft has released a patch for this vulnerability, which should be applied as soon as possible. Organizations should verify SSTP usage in their network infrastructure and review Microsoft's patch advisory for implementation guidance. Evidence limits suggest further verification is needed to confirm affected systems and scope.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-08-16
Advisory published
2026-08-11
Advisory updated
2026-08-16

Who should care

Organizations using Windows 10, Windows 11, and Windows Server systems should prioritize patching CVE-2026-62889, especially if SSTP is used in their network infrastructure. This includes operators, platform administrators, vulnerability management teams, and security teams responsible for ensuring the security and integrity of their systems and networks.

Technical summary

CVE-2026-62889 is a double-free vulnerability in Windows Secure Socket Tunneling Protocol (SSTP) that allows an unauthorized attacker to execute code over a network. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server. Microsoft has released a patch for this vulnerability, which should be applied as soon as possible.

Defensive priority

Microsoft Windows SSTP double-free vulnerability allows unauthorized network code execution; prioritize patching for Windows 10, 11, and Server systems.

Recommended defensive actions

  • Apply the Microsoft patch for CVE-2026-62889
  • Inventory Windows systems for SSTP usage
  • Monitor network traffic for suspicious SSTP activity
  • Consider compensating controls for unpatched systems
  • Review Microsoft's patch advisory for CVE-2026-62889

Evidence notes

Official CVE and NVD records confirm a double-free vulnerability in Windows Secure Socket Tunneling Protocol (SSTP); Microsoft provides a patch advisory. Evidence limits suggest further verification is needed to confirm affected systems and scope. Defenders should verify SSTP usage in their network infrastructure and review Microsoft's patch advisory for implementation guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62889 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62889

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

  • CVE-2026-62889 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62889

    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.