{"id":"CVE-2026-62815","aliases":["EUVD-2026-56392","GHSA-2q33-cf8w-7q23","GHSA-92f5-vc22-8j33"],"status":"published","title":"Microsoft QUIC Remote Code Execution Vulnerability","description":"Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00974,"percentile":0.62315,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2026-08-11T17:04:30Z","modified":"2026-10-30T17:20:19Z","fixes":[{"ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.OpenSSL","fixed_in":["2.5.10","2.4.19"],"sources":["ghsa","osv"]},{"ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.Schannel","fixed_in":["2.5.10","2.4.19"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.OpenSSL","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.5.3"},{"fixed":"2.5.10"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.Schannel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.5.3"},{"fixed":"2.5.10"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.OpenSSL","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.19"}]}]},{"source":"ghsa","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.Schannel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.19"}]}]},{"source":"osv","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.OpenSSL","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.5.3"},{"fixed":"2.5.10"}]}]},{"source":"osv","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.Schannel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.5.3"},{"fixed":"2.5.10"}]}]},{"source":"osv","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.OpenSSL","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.19"}]}],"versions":["1.8.0"]},{"source":"osv","ecosystem":"NuGet","package":"Microsoft.Native.Quic.MsQuic.Schannel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.19"}]}],"versions":["1.8.0"]}],"products":[{"vendor":"microsoft","product":"windows 11 version 23h2"},{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows 11 version 25h2"},{"vendor":"microsoft","product":"windows 11 version 26h1"},{"vendor":"microsoft","product":"windows server 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_11_23h2"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815","tags":["vendor-advisory","patch","Vendor Advisory","Patch","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62815","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-2q33-cf8w-7q23"},{"url":"https://github.com/microsoft/msquic/security/advisories/GHSA-92f5-vc22-8j33","tags":["web"]},{"url":"https://github.com/microsoft/msquic/pull/6217","tags":["web"]},{"url":"https://github.com/microsoft/msquic/pull/6219","tags":["web"]},{"url":"https://github.com/microsoft/msquic/pull/6220","tags":["web"]},{"url":"https://github.com/microsoft/msquic/commit/583e7d5b509bb0bfa3518482d98879b6eda41ad0","tags":["web"]},{"url":"https://github.com/microsoft/msquic/commit/9ff06b71fd4b4d5258361598ada5b24cbc1beb20","tags":["web"]},{"url":"https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b","tags":["web"]},{"url":"https://github.com/microsoft/msquic/releases/tag/v2.4.19","tags":["web"]},{"url":"https://github.com/microsoft/msquic/releases/tag/v2.5.10","tags":["web"]},{"url":"https://github.com/advisories/GHSA-92f5-vc22-8j33"},{"url":"https://github.com/microsoft/msquic","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-62815","title":"Microsoft QUIC Remote Code Execution Vulnerability","description":"Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-08-11T17:04:30.645Z","modified":"2026-10-30T17:20:19.234Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:20:14.665567Z"}],"euvd":[{"id":"EUVD-2026-56392","description":"Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-08-11T17:04:30Z","modified":"2026-10-30T17:20:19Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical"}],"updated_at":"2026-11-02T16:59:04.768038Z"}],"ghsa":[{"id":"GHSA-2q33-cf8w-7q23","title":"Duplicate Advisory: Microsoft QUIC Remote Code Execution Vulnerability","description":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-92f5-vc22-8j33. This link is maintained to preserve external references.\n\n## Original Description\n\nUse after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.","status":"withdrawn","published":"2026-08-11T18:31:26Z","modified":"2026-09-08T20:26:49Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:41:13.477974Z"},{"id":"GHSA-92f5-vc22-8j33","title":"Microsoft QUIC: Remote Code Execution Vulnerability","description":"# Summary\nUse after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.\n\n# Details\n\nNew network path creations and removals triggered by incoming packets can lead to a pointer invalidation.\n\n## Patches\n\n- Guard path promotion [e0f55b5](https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b)\n\n# Impact\n\nAn 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.","status":"published","published":"2026-09-08T20:27:02Z","modified":"2026-09-08T20:27:05Z","cvss":[{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:41:13.477974Z"}],"nvd":[{"id":"CVE-2026-62815","description":"Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-08-11T17:18:35.32Z","modified":"2026-08-14T18:46:24.667Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:12:36.499002Z"}],"osv":[{"id":"GHSA-2q33-cf8w-7q23","title":"Duplicate Advisory: Microsoft QUIC Remote Code Execution Vulnerability","description":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-92f5-vc22-8j33. This link is maintained to preserve external references.\n\n## Original Description\n\nUse after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.","status":"withdrawn","published":"2026-08-11T18:31:26Z","modified":"2026-09-08T20:45:05.405468329Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:46:34.700741Z"},{"id":"GHSA-92f5-vc22-8j33","title":"Microsoft QUIC: Remote Code Execution Vulnerability","description":"# Summary\nUse after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.\n\n# Details\n\nNew network path creations and removals triggered by incoming packets can lead to a pointer invalidation.\n\n## Patches\n\n- Guard path promotion [e0f55b5](https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b)\n\n# Impact\n\nAn 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.","status":"published","published":"2026-09-08T20:27:02Z","modified":"2026-09-08T20:55:58.931613Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"},{"version":"4.0","score":10,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","level":"critical"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:46:43.123867Z"}]}}