{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.32.1"
              },
              {
                "fixed": "0.40.5"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "589a9112bd0516befea756cc8e976fb1c4b031e9"
            },
            {
              "fixed": "1889911f0841e669de0be5bd02c737a3f1fd20fa"
            },
            {
              "fixed": "9275c5badda1d9d0cdad6f34598a111033eadb42"
            }
          ],
          "repo": "https://github.com/nvm-sh/nvm",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-4ghp-wxpw-rhpg"
  ],
  "database_specific": {
    "cna_assigner": "harborist",
    "cwe_ids": [
      "CWE-22",
      "CWE-73"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15921.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "0.32.1"
          },
          {
            "fixed": "0.40.6"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Node Version Manager (nvm) is a POSIX-compliant shell function for managing multiple node.js versions. In versions 0.32.1 through 0.40.5, `nvm ls-remote` (and other commands that refresh remote LTS aliases, such as `nvm install --lts`) parse the node.js mirror's `index.tab` and use each release's LTS codename field as an alias filename without validating it. A malicious, compromised, or man-in-the-middled mirror can return an LTS codename containing path-traversal sequences such as `../../../.bashrc`, causing nvm to write the associated version string to a path outside `$NVM_DIR/alias`. With the default layout (`$NVM_DIR` is `~/.nvm`), this can create or overwrite files in the user's home directory, including shell startup files, which can lead to code execution in a later shell session. Exploitation requires the victim to use a hostile mirror -- via a compromised mirror or CDN, a network man-in-the-middle, or a maliciously configured `NVM_NODEJS_ORG_MIRROR`/`NVM_IOJS_ORG_MIRROR` -- and to run an affected command. Version 0.40.6 validates remote LTS codenames as safe alias filenames and rejects `..` path components when writing alias files.",
  "id": "CVE-2026-15921",
  "modified": "2026-07-18T03:41:54.446999295Z",
  "published": "2026-07-15T21:16:46.936Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15921.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nvm-sh/nvm/security/advisories/GHSA-4ghp-wxpw-rhpg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15921"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nvm-sh/nvm/commit/9275c5badda1d9d0cdad6f34598a111033eadb42"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nvm-sh/nvm"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "nvm path traversal via a malicious mirror's LTS codename writes outside the alias directory"
}