{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "denial-of-service"
        ],
        "cvss": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "nostr::nips::nip44::decrypt",
            "nostr::nips::nip44::decrypt_to_bytes",
            "nostr::nips::nip44::v2::decrypt_to_bytes"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "nostr",
        "purl": "pkg:cargo/nostr"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.44.5"
            },
            {
              "introduced": "0.45.0-alpha.1"
            },
            {
              "fixed": "0.45.0-alpha.5"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "The NIP-44 v2 decryption path in the `nostr` crate contains a reachable panic\nwhen processing a short or empty ciphertext. After the HMAC check passes and the\nciphertext is decrypted via ChaCha20, the code reads a 2\u2011byte unpadded\u2011length\nprefix via `buffer[0..2]` without first verifying that the decrypted buffer\ncontains at least 2 bytes. A malicious sender who holds the symmetric\nconversation key (e.g., a direct\u2011message sender) can craft a payload that\nproduces a 0 or 1\u2011byte decrypted buffer, causing an index\u2011out\u2011of\u2011bounds panic.\nThis can be triggered remotely through any relay that delivers the crafted\nevent to the victim\u0027s client, resulting in a denial of service. No key material,\nplaintext, or memory corruption occurs.\n\nThe vulnerability is present in all versions from `0.26.0` up to `0.44.4`\n(inclusive) and in the alpha releases `0.45.0\u2011alpha.1` through `0.45.0\u2011alpha.4`.\nVersions `0.44.5` and `0.45.0\u2011alpha.5` contain the fix.\n\n## Credit\n\nDiscovered and responsibly disclosed by **Muhammed Shekho** (info@mhd-shekho.com, [mhd-shekho.com](https://mhd-shekho.com)).",
  "id": "RUSTSEC-2026-0216",
  "modified": "2026-07-27T14:44:28Z",
  "published": "2026-07-25T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/nostr"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0216.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nostrdevkit/nostr/commit/73bdd677b872641d57a2ebcc5afc23ee0e5f0d2d"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Remote Denial of Service via malformed NIP\u201144 v2 payload"
}