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CVE-2026-62815Withdrawn

Microsoft QUIC Remote Code Execution Vulnerability

CVSS 3.1 9.8 CRITICALEUVD CVSS 3.1 9.8 CVSS 3.1 · [email protected] · Secondary 9.8 CRITICALCVSS_V3 Publisher rating CRITICALCVSS_V3 CVSS_V4 Publisher rating CRITICALFixed by Microsoft.Native.Quic.MsQuic.OpenSSL 2.5.10 Fixed by Microsoft.Native.Quic.MsQuic.Schannel 2.5.10 Fixed by Microsoft.Native.Quic.MsQuic.OpenSSL 2.4.19 Fixed by Microsoft.Native.Quic.MsQuic.Schannel 2.4.19KEV status unknown

Original advisory

cve-program · CVE-2026-62815

Published

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

Read the publisher's advisory

euvd · EUVD-2026-56392

Published

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

Read the publisher's advisory

nvd · CVE-2026-62815

Published

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

Read the publisher's advisory

osv · GHSA-2q33-cf8w-7q23

Withdrawn

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-92f5-vc22-8j33. This link is maintained to preserve external references. ## Original Description Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

Read the publisher's advisory

osv · GHSA-92f5-vc22-8j33

Published

# Summary Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network. # Details New network path creations and removals triggered by incoming packets can lead to a pointer invalidation. ## Patches - Guard path promotion [e0f55b5](https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b) # Impact An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-62815

Published

Windows 11 version 23H2

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows 11 version 23H2",
                    "platforms": [
                        "ARM64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.22631.0",
                            "lessThan": "10.0.22631.7517",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows 11 Version 23H2

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows 11 Version 23H2",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.22631.0",
                            "lessThan": "10.0.22631.7517",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows 11 Version 24H2

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows 11 Version 24H2",
                    "platforms": [
                        "ARM64-based Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26100.0",
                            "lessThan": "10.0.26100.9168",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows 11 Version 25H2

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows 11 Version 25H2",
                    "platforms": [
                        "ARM64-based Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26200.0",
                            "lessThan": "10.0.26200.9168",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows 11 version 26H1

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows 11 version 26H1",
                    "platforms": [
                        "ARM64-based Systems",
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.28000.0",
                            "lessThan": "10.0.28000.2704",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2022

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2022",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.20348.0",
                            "lessThan": "10.0.20348.5499",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2025

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2025",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26100.0",
                            "lessThan": "10.0.26100.33296",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Windows Server 2025 (Server Core installation)

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Microsoft",
                    "product": "Windows Server 2025 (Server Core installation)",
                    "platforms": [
                        "x64-based Systems"
                    ],
                    "versions": [
                        {
                            "version": "10.0.26100.0",
                            "lessThan": "10.0.26100.33296",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-56392

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Aug 11, 2026, 5:04:30 PM

dateUpdated: Nov 10, 2026, 9:58:14 PM

2 related source bulletins · separate from aliases

msrc_CVE-2026-62815: Microsoft QUIC Remote Code Execution Vulnerability

CVE-2026-62815

NCSC-2026-0284: Kwetsbaarheden verholpen in Microsoft Windows

CVE-2026-50472 · CVE-2026-56174 · CVE-2026-54113 · CVE-2026-54984 · CVE-2026-49179 · CVE-2026-6727 · CVE-2026-59127 · CVE-2026-59128 · CVE-2026-59130 · CVE-2026-59132 · CVE-2026-59135 · CVE-2026-59134 · CVE-2026-59136 · CVE-2026-59137 · CVE-2026-59138 · CVE-2026-61345 · CVE-2026-61346 · CVE-2026-61353 · CVE-2026-61347 · CVE-2026-61348 · CVE-2026-61350 · CVE-2026-61356 · CVE-2026-61367 · CVE-2026-61923 · CVE-2026-61366 · CVE-2026-61368 · CVE-2026-61924 · CVE-2026-61925 · CVE-2026-61928 · CVE-2026-61930 · CVE-2026-61937 · CVE-2026-62692 · CVE-2026-61932 · CVE-2026-61936 · CVE-2026-61939 · CVE-2026-62690 · CVE-2026-62696 · CVE-2026-62699 · CVE-2026-62703 · CVE-2026-62707 · CVE-2026-62713 · CVE-2026-62712 · CVE-2026-62718 · CVE-2026-62715 · CVE-2026-62716 · CVE-2026-62719 · CVE-2026-62723 · CVE-2026-62724 · CVE-2026-62748 · CVE-2026-62729 · CVE-2026-62738 · CVE-2026-62746 · CVE-2026-62740 · CVE-2026-62753 · CVE-2026-62735 · CVE-2026-62739 · CVE-2026-62742 · CVE-2026-62745 · CVE-2026-62747 · CVE-2026-62750 · CVE-2026-62754 · CVE-2026-62783 · CVE-2026-62755 · CVE-2026-62758 · CVE-2026-62773 · CVE-2026-62774 · CVE-2026-62785 · CVE-2026-62777 · CVE-2026-62792 · CVE-2026-62784 · CVE-2026-62787 · CVE-2026-62795 · CVE-2026-62796 · CVE-2026-62797 · CVE-2026-62812 · CVE-2026-62816 · CVE-2026-62817 · CVE-2026-62818 · CVE-2026-62819 · CVE-2026-62820 · CVE-2026-62876 · CVE-2026-62877 · CVE-2026-62878 · CVE-2026-62889 · CVE-2026-62890 · CVE-2026-62892 · CVE-2026-62893 · CVE-2026-62894 · CVE-2026-62908 · CVE-2026-65662 · CVE-2026-65671 · CVE-2026-65678 · CVE-2026-65784 · CVE-2026-65786 · CVE-2026-65789 · CVE-2026-65787 · CVE-2026-65814 · CVE-2026-66799 · CVE-2026-68819 · CVE-2026-68820 · CVE-2026-70307 · CVE-2026-70304 · CVE-2026-70330 · CVE-2026-61352 · CVE-2026-70344 · CVE-2026-70345 · CVE-2026-70346 · CVE-2026-70347 · CVE-2026-42976 · CVE-2026-6726 · CVE-2026-59122 · CVE-2026-59125 · CVE-2026-59131 · CVE-2026-61349 · CVE-2026-61363 · CVE-2026-61364 · CVE-2026-61365 · CVE-2026-61358 · CVE-2026-61360 · CVE-2026-61920 · CVE-2026-61926 · CVE-2026-61918 · CVE-2026-61921 · CVE-2026-62698 · CVE-2026-62700 · CVE-2026-62701 · CVE-2026-62709 · CVE-2026-62710 · CVE-2026-62711 · CVE-2026-62720 · CVE-2026-62714 · CVE-2026-62717 · CVE-2026-62721 · CVE-2026-62725 · CVE-2026-62726 · CVE-2026-62728 · CVE-2026-62733 · CVE-2026-62743 · CVE-2026-62730 · CVE-2026-62732 · CVE-2026-62734 · CVE-2026-62757 · CVE-2026-62741 · CVE-2026-62752 · CVE-2026-62769 · CVE-2026-62771 · CVE-2026-62761 · CVE-2026-62768 · CVE-2026-62770 · CVE-2026-62776 · CVE-2026-62778 · CVE-2026-62782 · CVE-2026-62781 · CVE-2026-62800 · CVE-2026-62786 · CVE-2026-62790 · CVE-2026-62793 · CVE-2026-62803 · CVE-2026-62807 · CVE-2026-62814 · CVE-2026-62823 · CVE-2026-62822 · CVE-2026-62880 · CVE-2026-62881 · CVE-2026-62883 · CVE-2026-62885 · CVE-2026-62887 · CVE-2026-65681 · CVE-2026-65679 · CVE-2026-65773 · CVE-2026-65774 · CVE-2026-65775 · CVE-2026-65790 · CVE-2026-65791 · CVE-2026-65795 · CVE-2026-65794 · CVE-2026-65797 · CVE-2026-65799 · CVE-2026-65798 · CVE-2026-65796 · CVE-2026-66802 · CVE-2026-71331 · CVE-2026-62695 · CVE-2026-62702 · CVE-2026-62815 · CVE-2026-65672 · CVE-2026-59126 · CVE-2026-61359 · CVE-2026-61355 · CVE-2026-62751 · CVE-2026-62811 · CVE-2026-62832 · CVE-2026-62888 · CVE-2026-65777 · CVE-2026-61361 · CVE-2026-61927 · CVE-2026-61933 · CVE-2026-61934 · CVE-2026-62722 · CVE-2026-62737 · CVE-2026-62766 · CVE-2026-62779 · CVE-2026-62798 · CVE-2026-65785 · CVE-2026-65788 · CVE-2026-61357 · CVE-2026-61929 · CVE-2026-61938 · CVE-2026-62708 · CVE-2026-62736 · CVE-2026-62749 · CVE-2026-62780 · CVE-2026-62788 · CVE-2026-65776 · CVE-2026-56179 · CVE-2026-62688 · CVE-2026-62705 · CVE-2026-66804 · CVE-2026-62693 · CVE-2026-65783 · CVE-2026-70348 · CVE-2026-65779 · CVE-2026-65780 · CVE-2026-65778 · CVE-2026-65782 · CVE-2026-65781 · CVE-2026-62772 · CVE-2026-62775 · CVE-2026-62799 · CVE-2026-62824 · CVE-2026-59124 · CVE-2026-59133

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-62815

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-416

Original publisher date fields

published: 2026-08-11T17:18:35.320

lastModified: 2026-08-14T18:46:24.667

10 source CPE criteria · context only

cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-2q33-cf8w-7q23

Withdrawn

Microsoft.Native.Quic.MsQuic.OpenSSL

NuGet

ECOSYSTEM · introduced 0

1 versions listed as affected

1.8.0

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-92f5-vc22-8j33

Published

Microsoft.Native.Quic.MsQuic.OpenSSL

NuGet

ECOSYSTEM · introduced 2.5.3 → fixed 2.5.10

Microsoft.Native.Quic.MsQuic.Schannel

NuGet

ECOSYSTEM · introduced 2.5.3 → fixed 2.5.10

Microsoft.Native.Quic.MsQuic.OpenSSL

NuGet

ECOSYSTEM · introduced 0 → fixed 2.4.19

1 versions listed as affected

1.8.0

Microsoft.Native.Quic.MsQuic.Schannel

NuGet

ECOSYSTEM · introduced 0 → fixed 2.4.19

1 versions listed as affected

1.8.0

Original source record · Cite this exact observation · Complete original publisher JSON