{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.35.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26679828f74ee6e82a4100904e6361f993ff5390"
            }
          ],
          "repo": "https://github.com/nixos/nix",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-6h4g-g5j9-fm5f"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-367",
      "CWE-61"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64846.json"
  },
  "details": "Nix is a package manager for Linux and other Unix systems. Prior to 2.35.0, a malicious derivation executed with the recursive-nix experimental feature can exploit a time-of-check/time-of-use race involving final symlink handling in the LocalStore restore path. The race can cause writeFile to follow a substituted final symlink when opening a path with O_TRUNC instead of enforcing FinalSymlink::DontFollow, allowing the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with the daemon user's permissions. The primitive does not provide arbitrary-content writes and requires winning the race. This issue is fixed in version 2.35.0.",
  "id": "CVE-2026-64846",
  "modified": "2026-08-22T03:30:54.280177657Z",
  "published": "2026-08-20T16:18:06.729Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64846.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64846"
    },
    {
      "type": "FIX",
      "url": "https://github.com/NixOS/nix/commit/26679828f74ee6e82a4100904e6361f993ff5390"
    },
    {
      "type": "FIX",
      "url": "https://github.com/NixOS/nix/pull/15401"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Nix: Arbitrary file truncation outside the sandbox with recursive-nix experimental feature"
}