data/osv/GO-2026-6607.json

{
  "schema_version": "1.3.1",
  "id": "GO-2026-6607",
  "modified": "0001-01-01T00:00:00Z",
  "published": "0001-01-01T00:00:00Z",
  "aliases": [
    "CVE-2026-97031"
  ],
  "summary": "Reject malformed ECH outer extension references in crypto/tls",
  "details": "Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references.\n\nWe now reject these as malformed and curb the memory amplification vector as a result.",
  "affected": [
    {
      "package": {
        "name": "stdlib",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.26.9"
            },
            {
              "introduced": "1.27.0-0"
            },
            {
              "fixed": "1.27.2"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "crypto/tls",
            "symbols": [
              "Conn.Handshake",
              "Conn.HandshakeContext",
              "Conn.Read",
              "Conn.Write",
              "Dial",
              "DialWithDialer",
              "Dialer.Dial",
              "Dialer.DialContext",
              "QUICConn.Start",
              "decodeInnerClientHello"
            ]
          }
        ]
      }
    }
  ],
  "references": [
    {
      "type": "FIX",
      "url": "https://go.dev/cl/847312"
    },
    {
      "type": "REPORT",
      "url": "https://go.dev/issue/81855"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"
    }
  ],
  "database_specific": {
    "url": "https://pkg.go.dev/vuln/GO-2026-6607",
    "review_status": "REVIEWED"
  }
}