data/osv/GO-2026-6355.json

{
  "schema_version": "1.3.1",
  "id": "GO-2026-6355",
  "modified": "0001-01-01T00:00:00Z",
  "published": "0001-01-01T00:00:00Z",
  "aliases": [
    "CVE-2026-56855"
  ],
  "summary": "Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh",
  "details": "Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection.\n\nNow, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.",
  "affected": [
    {
      "package": {
        "name": "golang.org/x/crypto",
        "ecosystem": "Go"
      },
      "ranges": [
        {
          "type": "SEMVER",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.56.0"
            }
          ]
        }
      ],
      "ecosystem_specific": {
        "imports": [
          {
            "path": "golang.org/x/crypto/ssh",
            "symbols": [
              "Dial",
              "NewClientConn",
              "NewControlClientConn",
              "NewServerConn",
              "channel.handlePacket"
            ]
          }
        ]
      }
    }
  ],
  "references": [
    {
      "type": "REPORT",
      "url": "https://go.dev/issue/81317"
    },
    {
      "type": "FIX",
      "url": "https://go.dev/cl/826524"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/golang-announce/c/1y3fb2np35U"
    }
  ],
  "credits": [
    {
      "name": "Will Mortensen"
    }
  ],
  "database_specific": {
    "url": "https://pkg.go.dev/vuln/GO-2026-6355",
    "review_status": "REVIEWED"
  }
}