data/osv/GO-2026-5856.json

{
  "schema_version": "1.3.1",
  "id": "GO-2026-5856",
  "modified": "0001-01-01T00:00:00Z",
  "published": "0001-01-01T00:00:00Z",
  "aliases": [
    "CVE-2026-42505"
  ],
  "summary": "Invoking Encrypted Client Hello privacy leak in crypto/tls",
  "details": "Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.",
  "affected": [
    {
      "package": {
        "name": "stdlib",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.25.12"
            },
            {
              "introduced": "1.26.0-0"
            },
            {
              "fixed": "1.26.5"
            },
            {
              "introduced": "1.27.0-0"
            },
            {
              "fixed": "1.27.0-rc.2"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "crypto/tls",
            "symbols": [
              "Conn.Handshake",
              "Conn.HandshakeContext",
              "Conn.Read",
              "Conn.Write",
              "Dial",
              "DialWithDialer",
              "Dialer.Dial",
              "Dialer.DialContext",
              "QUICConn.HandleData",
              "QUICConn.SendSessionTicket",
              "QUICConn.Start",
              "clientHelloMsg.marshalMsg"
            ]
          }
        ]
      }
    }
  ],
  "references": [
    {
      "type": "FIX",
      "url": "https://go.dev/cl/775960"
    },
    {
      "type": "REPORT",
      "url": "https://go.dev/issue/79282"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc"
    }
  ],
  "credits": [
    {
      "name": "Coia Prant (github.com/rbqvq)"
    }
  ],
  "database_specific": {
    "url": "https://pkg.go.dev/vuln/GO-2026-5856",
    "review_status": "REVIEWED"
  }
}