{"id":"CVE-2026-62815","title":"Microsoft QUIC Remote Code Execution Vulnerability","summary":"Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.","severity":"critical","cvss":9.8,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-416"],"vendor":"Microsoft","product":"Windows 11 version 23H2","affected":["windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7517","windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7517","windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.9168","windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.9168","windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2704","windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499","windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296","windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.33296"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-08-10T00:00:00+00:00"},"published":"2026-08-11","updated":"2026-09-16","sourceUpdated":"2026-09-16T16:23:59.821Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-62815","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815","label":"Microsoft QUIC Remote Code Execution Vulnerability"},{"url":"https://github.com/microsoft/msquic/security/advisories/GHSA-92f5-vc22-8j33"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62815"},{"url":"https://github.com/microsoft/msquic/pull/6217"},{"url":"https://github.com/microsoft/msquic/pull/6219"},{"url":"https://github.com/microsoft/msquic/pull/6220"},{"url":"https://github.com/microsoft/msquic/commit/583e7d5b509bb0bfa3518482d98879b6eda41ad0"},{"url":"https://github.com/microsoft/msquic/commit/9ff06b71fd4b4d5258361598ada5b24cbc1beb20"},{"url":"https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b"},{"url":"https://github.com/microsoft/msquic/releases/tag/v2.4.19"},{"url":"https://github.com/microsoft/msquic/releases/tag/v2.5.10"},{"url":"https://github.com/advisories/GHSA-92f5-vc22-8j33"}],"tags":["cve.org","ghsa","nuget"],"epss":0.01238,"epssPercentile":0.67287,"aliases":["GHSA-92f5-vc22-8j33"],"ecosystem":"nuget","patched":["Microsoft.Native.Quic.MsQuic.OpenSSL 2.5.10","Microsoft.Native.Quic.MsQuic.Schannel 2.5.10","Microsoft.Native.Quic.MsQuic.OpenSSL 2.4.19","Microsoft.Native.Quic.MsQuic.Schannel 2.4.19"],"ingestedAt":"2026-09-08T18:07:34.898Z","slug":"CVE-2026-62815","body":"## Overview\n\nUse after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.\n\n## Affected\n\n- `windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7517`\n- `windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.7517`\n- `windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.9168`\n- `windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.9168`\n- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.2704`\n- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499`\n- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296`\n- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.33296`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-62815)\n\nAffected packages:\n\n- `Microsoft.Native.Quic.MsQuic.OpenSSL >= 2.5.3, < 2.5.10`\n- `Microsoft.Native.Quic.MsQuic.Schannel >= 2.5.3, < 2.5.10`\n- `Microsoft.Native.Quic.MsQuic.OpenSSL < 2.4.19`\n- `Microsoft.Native.Quic.MsQuic.Schannel < 2.4.19`\n\nPatched in:\n\n- `Microsoft.Native.Quic.MsQuic.OpenSSL 2.5.10`\n- `Microsoft.Native.Quic.MsQuic.Schannel 2.5.10`\n- `Microsoft.Native.Quic.MsQuic.OpenSSL 2.4.19`\n- `Microsoft.Native.Quic.MsQuic.Schannel 2.4.19`\n\nSource: https://github.com/advisories/GHSA-92f5-vc22-8j33","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}