virtualenv: Command injection via --prompt in activate.bat (batch activator)

{
  "id": "86fad34a71d353660829408fe6c6bccb496419d58825805fc10f76ea4fd6407c",
  "url": "https://osv.dev/vulnerability/BIT-virtualenv-2026-102937",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "virtualenv: Command injection via --prompt in activate.bat (batch activator)",
    "summary": "virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.12, BatchActivator.quote() returns prompt text unchanged before activate.bat inserts it into a cmd.exe set \"VAR=value\" statement. An attacker who influences --prompt, VIRTUALENV_PROMPT, or the corresponding configuration value can include a double quote that closes the assignment and leaves following cmd.exe operators as executable syntax. When a user activates the generated Windows environment, the injected commands run with that user's privileges. This issue is fixed in version 21.7.12.",
    "evidence": "osv:BIT-virtualenv-2026-102937",
    "products": [
      {
        "name": {
          "value": "virtualenv",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "21.7.12",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-virtualenv-2026-102937",
      "aliases": [
        "BIT-virtualenv-2026-102937",
        "CVE-2026-102937",
        "GHSA-x78j-v8h9-3j2q",
        "PYSEC-2026-4014"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "21.7.12"
                }
              ]
            }
          ],
          "package": {
            "name": "virtualenv",
            "purl": "pkg:bitnami/virtualenv",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V4",
              "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/virtualenv/BIT-virtualenv-2026-102937.json"
          }
        }
      ],
      "modified": "2026-10-06T15:26:00.196757436Z",
      "provider": "osv",
      "references": [
        "https://github.com/pypa/virtualenv/commit/d721ff140ce4afdc2a9b76751e4584e25d9fbea6",
        "https://github.com/pypa/virtualenv/pull/3250",
        "https://github.com/pypa/virtualenv/releases/tag/21.7.12",
        "https://github.com/pypa/virtualenv/security/advisories/GHSA-x78j-v8h9-3j2q",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-102937"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:virtualenv:virtualenv:*:*:*:*:*:python:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-102937",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 89146,
  "published_at": "2026-10-06T11:57:38.51+00:00"
}