{"id":"CVE-2026-62815","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-62815","summary":"Microsoft QUIC: Remote Code Execution Vulnerability","details":"# 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.","published":"2026-09-08T20:27:02Z","modified":"2026-09-08T20:55:58.931613Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"NuGet","name":"Microsoft.Native.Quic.MsQuic.OpenSSL","fixedVersion":"2.5.10"},{"ecosystem":"NuGet","name":"Microsoft.Native.Quic.MsQuic.Schannel","fixedVersion":"2.5.10"},{"ecosystem":"NuGet","name":"Microsoft.Native.Quic.MsQuic.OpenSSL","fixedVersion":"2.4.19"},{"ecosystem":"NuGet","name":"Microsoft.Native.Quic.MsQuic.Schannel","fixedVersion":"2.4.19"}],"fix":{"url":"https://github.com/microsoft/msquic/pull/6217","label":"microsoft/msquic#6217"},"references":[{"type":"WEB","url":"https://github.com/microsoft/msquic/security/advisories/GHSA-92f5-vc22-8j33"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62815"},{"type":"WEB","url":"https://github.com/microsoft/msquic/pull/6217"},{"type":"WEB","url":"https://github.com/microsoft/msquic/pull/6219"},{"type":"WEB","url":"https://github.com/microsoft/msquic/pull/6220"},{"type":"WEB","url":"https://github.com/microsoft/msquic/commit/583e7d5b509bb0bfa3518482d98879b6eda41ad0"},{"type":"WEB","url":"https://github.com/microsoft/msquic/commit/9ff06b71fd4b4d5258361598ada5b24cbc1beb20"},{"type":"WEB","url":"https://github.com/microsoft/msquic/commit/e0f55b5fdc9fff0b4465976d066ebd22fb7e2b3b"},{"type":"PACKAGE","url":"https://github.com/microsoft/msquic"},{"type":"WEB","url":"https://github.com/microsoft/msquic/releases/tag/v2.4.19"},{"type":"WEB","url":"https://github.com/microsoft/msquic/releases/tag/v2.5.10"},{"type":"WEB","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62815"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-08T20:55:58.931613Z"}}