{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.4.20"
              },
              {
                "introduced": "2.5.0"
              },
              {
                "fixed": "2.5.11"
              },
              {
                "introduced": "2.6.0"
              },
              {
                "fixed": "2.6.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "ac75f78962cf6953c8804d96dc3bb96a308e20cf"
            },
            {
              "introduced": "e7e7a114e20a55ec2d5f723cf6bdf3bfb7b0b24a"
            },
            {
              "fixed": "90fd45498bf9b506b8556fb407088688474d6c81"
            },
            {
              "fixed": "0591586443cc73a2d2cfb679527d91a144b4a412"
            },
            {
              "fixed": "a01333cf7c2659cce0ff03ef3f21e1ff15bb5b83"
            },
            {
              "fixed": "508e811370df93e2ad848f5c78347d4fe4f65a91"
            }
          ],
          "repo": "https://github.com/microsoft/msquic",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-w5f4-fx9m-m4q7"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-295"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105794.json"
  },
  "details": "MsQuic is a cross-platform C implementation of the IETF QUIC protocol exposed to C, C++, C#, and Rust. Prior to 2.4.20, 2.5.11, and 2.6.1, MsQuic clients using the OpenSSL or QuicTLS TLS backend do not properly verify that a server certificate matches the intended target server hostname. An on-path attacker can therefore present a certificate that does not match the intended target hostname and spoof the server in a man-in-the-middle attack. The Schannel backend is not affected. This issue is fixed in versions 2.4.20, 2.5.11, and 2.6.1.",
  "id": "CVE-2026-105794",
  "modified": "2026-10-08T02:31:03.101050958Z",
  "published": "2026-10-06T14:14:54.483Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105794.json"
    },
    {
      "type": "ADVISORY",
      "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": "FIX",
      "url": "https://github.com/microsoft/msquic/commit/0591586443cc73a2d2cfb679527d91a144b4a412"
    },
    {
      "type": "FIX",
      "url": "https://github.com/microsoft/msquic/commit/508e811370df93e2ad848f5c78347d4fe4f65a91"
    },
    {
      "type": "FIX",
      "url": "https://github.com/microsoft/msquic/commit/90fd45498bf9b506b8556fb407088688474d6c81"
    },
    {
      "type": "FIX",
      "url": "https://github.com/microsoft/msquic/commit/a01333cf7c2659cce0ff03ef3f21e1ff15bb5b83"
    },
    {
      "type": "FIX",
      "url": "https://github.com/microsoft/msquic/pull/6274"
    },
    {
      "type": "FIX",
      "url": "https://github.com/microsoft/msquic/pull/6275"
    },
    {
      "type": "FIX",
      "url": "https://github.com/microsoft/msquic/pull/6276"
    },
    {
      "type": "FIX",
      "url": "https://github.com/microsoft/msquic/pull/6277"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "MsQuic: Improper Certificate Validation in Microsoft.Native.Quic.MsQuic.OpenSSL"
}