Vulnerabilities in pkg:nuget/Microsoft.Native.Quic.MsQuic.OpenSSL

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-w5f4-fx9m-m4q7",
  "modified" : "2026-10-06T15:33:08Z",
  "published" : "2026-10-06T15:33:08Z",
  "aliases" : [ "CVE-2026-105794" ],
  "summary" : "MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL",
  "details" : "# Summary\n\nImproper TLS hostname verification allows a man-in-the-middle (MITM) attack on MsQuic. \n\n# Details\n\nOnly MsQuic with the OpenSSL and QuicTLS TLS backends is affected (the Schannel backend is not affected).\n\n## Patches\n\n2.6.1, 2.5.11, and 2.4.20\n\n# Impact\n\nAn on-path attacker could spoof a server identity by using a certificate that doesn't match the intended target server hostname.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.Native.Quic.MsQuic.OpenSSL"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.4.20"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.Native.Quic.MsQuic.OpenSSL"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.5.0"
      }, {
        "fixed" : "2.5.11"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Microsoft.Native.Quic.MsQuic.OpenSSL"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.6.0"
      }, {
        "fixed" : "2.6.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/security/advisories/GHSA-w5f4-fx9m-m4q7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-105794"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/pull/6274"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/pull/6275"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/pull/6276"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/pull/6277"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/commit/0591586443cc73a2d2cfb679527d91a144b4a412"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/commit/508e811370df93e2ad848f5c78347d4fe4f65a91"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/commit/90fd45498bf9b506b8556fb407088688474d6c81"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/commit/a01333cf7c2659cce0ff03ef3f21e1ff15bb5b83"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/microsoft/msquic"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/releases/tag/v2.4.20"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/releases/tag/v2.5.11"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/microsoft/msquic/releases/tag/v2.6.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-06T15:33:08Z",
    "nvd_published_at" : "2026-10-06T15:17:16Z"
  }
}