Advisory severityCritical9.8Microsoft Server

Critical [CVE-2026-62815] Microsoft QUIC Remote Code Execution Vulnerability

This critical-severity Microsoft Server advisory covers CVE-2026-62815 affecting Windows Server 2022, Windows Server 2025.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-62815 Source published Aug 11, 2026Source updated Aug 11, 2026

VulniPulse record published Aug 11, 2026Record updated Aug 13, 2026

CVE-2026-62815

Affected products & platforms

Microsoft ServerWindows Server

Open source advisory

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Summary

Microsoft QUIC Remote Code Execution Vulnerability

Affected products named by the advisory: Windows Server 2022; Windows Server 2025.

Affected versions

Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7517
Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7517
Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.9168
Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.9168
Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.2704
Windows Server 2022 10.0.20348.0 before 10.0.20348.5499
Windows Server 2025 10.0.26100.0 before 10.0.26100.33296
Windows Server 2025 (Server Core installation) 10.0.26100.0 before 10.0.26100.33296

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions

KB5120242 (build 10.0.20348.5499)
KB5120229 (build 10.0.20348.5440)
KB5120233 (build 10.0.26100.33296)
KB5120228 (build 10.0.26100.33222)
KB5121003 (build 10.0.26100.9168)
KB5120994 (build 10.0.26100.9106)
KB5120240 (build 10.0.22631.7517)
KB5121000 (build 10.0.28000.2704)

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Install the applicable security update for your platform: KB5120242, KB5120229, KB5120233, KB5120228, KB5121003, KB5120994 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Microsoft Security Update Guide (MSRC)official
Official vendor source used to discover this advisory; it remains the authority for affected products and remediation. Discovered from the machine-readable feed https://api.msrc.microsoft.com/cvrf/v3.0/updates; this link opens the Microsoft Server advisory index instead of the raw feed document.
Microsoft Server
Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Microsoft Server
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-62815NVD CVE.org MITRE

Official resources

Microsoft Update Catalog: KB5120242
Official documentation
Direct download of the KB5120242 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5120229
Official documentation
Direct download of the KB5120229 security update named in the MSRC remediation data for this CVE.
Microsoft Update Catalog: KB5120233
Official documentation
Direct download of the KB5120233 security update named in the MSRC remediation data for this CVE.
MSRC Security Update Guide
Official documentation
Filter by this CVE for per-product KB numbers, severity and exploitability assessment.

Discussion(0)

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