{
  "affected": [
    {}
  ],
  "details": "The Noise protocol implementation suffers from weakened cryptographic security after encrypting 2^64 messages, and a potential denial of service attack. After 2^64 (~18.4 quintillion) messages are encrypted with the Encrypt function, the nonce counter will wrap around, causing multiple messages to be encrypted with the same key and nonce. In a separate issue, the Decrypt function increments the nonce state even when it fails to decrypt a message. If an attacker can provide an invalid input to the Decrypt function, this will cause the nonce state to desynchronize between the peers, resulting in a failure to encrypt all subsequent messages.",
  "id": "CVE-2021-4239",
  "modified": "2026-03-14T13:51:49.692868419Z",
  "published": "2022-12-27T22:15:12.123Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/flynn/noise/pull/44"
    },
    {
      "type": "FIX",
      "url": "https://pkg.go.dev/vuln/GO-2022-0425"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}