BREW-VIRTUALENV-CVE-2026-22702 (CVE-2026-22702)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:46 – Updated: 2026-09-24 09:59 – Source website
VLAI
Summary
virtualenv Has TOCTOU Vulnerabilities in Directory Creation
Details

virtualenv is a tool for creating isolated virtual python environments. Prior to version 20.36.1, TOCTOU (Time-of-Check-Time-of-Use) vulnerabilities in virtualenv allow local attackers to perform symlink-based attacks on directory creation operations. An attacker with local access can exploit a race condition between directory existence checks and creation to redirect virtualenv's app_data and lock file operations to attacker-controlled locations. This issue has been patched in version 20.36.1.

Severity
4.5 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "20.36.1"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "virtualenv",
        "purl": "pkg:brew/virtualenv"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "21.7.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "git",
    "upstream_evidence": [
      {
        "ecosystem": "GIT",
        "key": "https://github.com/pypa/virtualenv",
        "name": "https://github.com/pypa/virtualenv",
        "strategy": "git",
        "subject_version": "21.11.0"
      },
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/virtualenv@21.11.0",
        "name": "virtualenv",
        "strategy": "registry",
        "subject_version": "21.11.0"
      },
      {
        "ecosystem": "Debian",
        "key": "Debian/python-virtualenv",
        "name": "python-virtualenv",
        "strategy": "distro"
      },
      {
        "ecosystem": "GIT",
        "key": "upstream:https://github.com/pypa/virtualenv",
        "name": "https://github.com/pypa/virtualenv",
        "strategy": "distro",
        "subject_version": "21.11.0"
      },
      {
        "ecosystem": "PyPI",
        "key": "upstream:pkg:pypi/virtualenv@21.11.0",
        "name": "virtualenv",
        "strategy": "distro",
        "subject_version": "21.11.0"
      },
      {
        "ecosystem": "Ubuntu",
        "key": "Ubuntu/python-virtualenv",
        "name": "python-virtualenv",
        "strategy": "distro"
      }
    ]
  },
  "details": "virtualenv is a tool for creating isolated virtual python environments. Prior to version 20.36.1, TOCTOU (Time-of-Check-Time-of-Use) vulnerabilities in virtualenv allow local attackers to perform symlink-based attacks on directory creation operations. An attacker with local access can exploit a race condition between directory existence checks and creation to redirect virtualenv\u0027s app_data and lock file operations to attacker-controlled locations. This issue has been patched in version 20.36.1.",
  "id": "BREW-virtualenv-CVE-2026-22702",
  "modified": "2026-09-24T09:59:49Z",
  "published": "2026-08-13T17:46:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22702.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/pypa/virtualenv/security/advisories/GHSA-597g-3phw-6986"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22702"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pypa/virtualenv/commit/dec4cec5d16edaf83a00a658f32d1e032661cebc"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pypa/virtualenv/pull/3013"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "virtualenv Has TOCTOU Vulnerabilities in Directory Creation",
  "upstream": [
    "CVE-2026-22702",
    "BIT-virtualenv-2026-22702",
    "GHSA-597g-3phw-6986",
    "PYSEC-2026-2009"
  ]
}



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