{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "libcrux_sha3::avx2::x4::shake256"
          ],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "libcrux-sha3",
        "purl": "pkg:cargo/libcrux-sha3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.0.10"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "The AVX2-optimized implementation of SHAKE-256 intended for use in\nML-KEM and ML-DSA would panic if the length of the output buffers was\ngreater than 32 and not a multiple of 8, due to an out-of-bounds\nindexing operation.\n\n## Impact\nThis bug impacts users on AVX2 platforms that use the\n`libcrux_sha3::avx2::x4::shake256` API outside of ML-KEM or ML-DSA\nwith output buffers of length `\u003e 32` and not divisible by `8`. It does\nnot impact the use in ML-KEM or ML-DSA because there output buffer\nlengths are always divisible by `8`.\n\n## Mitigation\nStarting from version `0.0.10`, the AVX2-optimized SHAKE-256 will no\nlonger panic on output buffer lengths `\u003e 32` that are not divisible by\n`8`.",
  "id": "RUSTSEC-2026-0208",
  "modified": "2026-07-17T11:34:24Z",
  "published": "2026-05-21T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/libcrux-sha3"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0208.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/celabshq/libcrux/pull/1456"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Potential Panic in AVX2 SHAKE-256"
}