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    BREW-CLOUDISCOVERY-CVE-2… (PYSEC-2026-4014)

    Vulnerability from osv_homebrew – Published: 2026-09-30 21:05 – Updated: 2026-09-30 21:05 – Source website
    VLAI
    Summary
    Command injection via --prompt in activate.bat (batch activator)
    Details

    BatchActivator.quote() returned its input unchanged, the only activator with no escaping at all. --prompt, the VIRTUALENV_PROMPT environment variable, and the config file all set the prompt, and activate.bat writes it straight into @set "VAR=value". A prompt containing a double quote closes that string early, and whatever follows runs as live cmd.exe syntax. For example, a venv created with --prompt 'x" & calc & "' runs calc the moment someone runs activate.bat.

    Anyone who templates a prompt from untrusted input (a CI job using a branch name, a wrapper script deriving an environment name from user input) hands an attacker code execution in the shell of anyone who activates the resulting venv on Windows.

    Fixed in 21.7.12 by escaping the characters cmd.exe treats as live syntax inside this construct.

    References
    To clipboard 

    {
  "affected": [
    {
      "ecosystem_specific": {
        "fix": null,
        "range_state": "affected",
        "resource": "virtualenv",
        "resource_purl": "pkg:pypi/virtualenv@20.31.2",
        "upstream_fixed_in": "21.7.12"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "cloudiscovery",
        "purl": "pkg:brew/cloudiscovery"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.4.4_4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/virtualenv@20.31.2",
        "name": "virtualenv",
        "resource": "virtualenv",
        "strategy": "registry",
        "subject_version": "20.31.2"
      }
    ]
  },
  "details": "`BatchActivator.quote()` returned its input unchanged, the only activator with\nno escaping at all. `--prompt`, the `VIRTUALENV_PROMPT` environment variable,\nand the config file all set the prompt, and `activate.bat` writes it straight\ninto `@set \"VAR=value\"`. A prompt containing a double quote closes that string\nearly, and whatever follows runs as live cmd.exe syntax. For example, a venv\ncreated with `--prompt \u0027x\" \u0026 calc \u0026 \"\u0027` runs `calc` the moment someone runs\n`activate.bat`.\n\nAnyone who templates a prompt from untrusted input (a CI job using a branch\nname, a wrapper script deriving an environment name from user input) hands an\nattacker code execution in the shell of anyone who activates the resulting venv\non Windows.\n\nFixed in 21.7.12 by escaping the characters cmd.exe treats as live syntax\ninside this construct.\n",
  "id": "BREW-cloudiscovery-CVE-2026-102937",
  "modified": "2026-09-30T21:05:15Z",
  "published": "2026-09-30T21:05:15Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pypa/virtualenv/security/advisories/GHSA-x78j-v8h9-3j2q"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/virtualenv/pull/3250"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pypa/virtualenv/commit/d721ff140ce4afdc2a9b76751e4584e25d9fbea6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/virtualenv/releases/tag/21.7.12"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pypa/virtualenv"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/virtualenv"
    }
  ],
  "schema_version": "1.7.3",
  "summary": "Command injection via --prompt in activate.bat (batch activator)",
  "upstream": [
    "PYSEC-2026-4014",
    "CVE-2026-102937",
    "GHSA-x78j-v8h9-3j2q"
  ]
}

    CVE-2026-102937 (GCVE-0-2026-102937)

    Vulnerability from cvelistv5 – Published: 2026-09-29 20:56 – Updated: 2026-09-29 20:56
    VLAI
    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.
    Severity
    7.3 (High)
    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
    CWE
    • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
    Assigner
    References
    Impacted products
    Vendor Product Version
    pypa virtualenv Affected: < 21.7.12
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "virtualenv",
          "vendor": "pypa",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 21.7.12"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s privileges. This issue is fixed in version 21.7.12."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-78",
              "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-29T20:56:13.998Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pypa/virtualenv/security/advisories/GHSA-x78j-v8h9-3j2q",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pypa/virtualenv/security/advisories/GHSA-x78j-v8h9-3j2q"
        },
        {
          "name": "https://github.com/pypa/virtualenv/pull/3250",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pypa/virtualenv/pull/3250"
        },
        {
          "name": "https://github.com/pypa/virtualenv/commit/d721ff140ce4afdc2a9b76751e4584e25d9fbea6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pypa/virtualenv/commit/d721ff140ce4afdc2a9b76751e4584e25d9fbea6"
        },
        {
          "name": "https://github.com/pypa/virtualenv/releases/tag/21.7.12",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pypa/virtualenv/releases/tag/21.7.12"
        }
      ],
      "source": {
        "advisory": "GHSA-x78j-v8h9-3j2q",
        "discovery": "UNKNOWN"
      },
      "title": "virtualenv: Command injection via --prompt in activate.bat (batch activator)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-102937",
    "datePublished": "2026-09-29T20:56:13.998Z",
    "dateReserved": "2026-09-29T20:24:43.340Z",
    "dateUpdated": "2026-09-29T20:56:13.998Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    PYSEC-2026-4014

    Vulnerability from pysec - Published: 2026-09-18 01:41 - Updated: 2026-09-30 16:13
    VLAI
    Details

    BatchActivator.quote() returned its input unchanged, the only activator with no escaping at all. --prompt, the VIRTUALENV_PROMPT environment variable, and the config file all set the prompt, and activate.bat writes it straight into @set "VAR=value". A prompt containing a double quote closes that string early, and whatever follows runs as live cmd.exe syntax. For example, a venv created with --prompt 'x" & calc & "' runs calc the moment someone runs activate.bat.

    Anyone who templates a prompt from untrusted input (a CI job using a branch name, a wrapper script deriving an environment name from user input) hands an attacker code execution in the shell of anyone who activates the resulting venv on Windows.

    Fixed in 21.7.12 by escaping the characters cmd.exe treats as live syntax inside this construct.

    Impacted products
    Name purl
    virtualenv pkg:pypi/virtualenv
    Aliases
    To clipboard 

    {
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "virtualenv",
        "purl": "pkg:pypi/virtualenv"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "21.7.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.8",
        "0.8.1",
        "0.8.2",
        "0.8.3",
        "0.8.4",
        "0.9",
        "0.9.1",
        "0.9.2",
        "1.0",
        "1.1",
        "1.10",
        "1.10.1",
        "1.11",
        "1.11.1",
        "1.11.2",
        "1.11.3",
        "1.11.4",
        "1.11.5",
        "1.11.6",
        "1.2",
        "1.3",
        "1.3.1",
        "1.3.2",
        "1.3.3",
        "1.3.4",
        "1.4",
        "1.4.1",
        "1.4.2",
        "1.4.3",
        "1.4.4",
        "1.4.5",
        "1.4.6",
        "1.4.7",
        "1.4.8",
        "1.4.9",
        "1.4rc1",
        "1.5",
        "1.5.1",
        "1.5.2",
        "1.6",
        "1.6.1",
        "1.6.2",
        "1.6.3",
        "1.6.4",
        "1.7",
        "1.7.1",
        "1.7.1.1",
        "1.7.1.2",
        "1.7.2",
        "1.8",
        "1.8.1",
        "1.8.2",
        "1.8.3",
        "1.8.4",
        "1.9",
        "1.9.1",
        "12.0",
        "12.0.1",
        "12.0.2",
        "12.0.4",
        "12.0.5",
        "12.0.6",
        "12.0.7",
        "12.1.0",
        "12.1.1",
        "13.0.0",
        "13.0.1",
        "13.0.2",
        "13.0.3",
        "13.1.0",
        "13.1.1",
        "13.1.2",
        "14.0.0",
        "14.0.1",
        "14.0.2",
        "14.0.3",
        "14.0.4",
        "14.0.5",
        "14.0.6",
        "15.0.0",
        "15.0.1",
        "15.0.2",
        "15.0.3",
        "15.1.0",
        "15.2.0",
        "16.0.0",
        "16.1.0",
        "16.2.0",
        "16.3.0",
        "16.3.1.dev0",
        "16.4.0",
        "16.4.1",
        "16.4.3",
        "16.4.4.dev0",
        "16.5.0",
        "16.6.0",
        "16.6.1",
        "16.6.2",
        "16.7.0",
        "16.7.1",
        "16.7.10",
        "16.7.11",
        "16.7.12",
        "16.7.2",
        "16.7.3",
        "16.7.4",
        "16.7.5",
        "16.7.6",
        "16.7.7",
        "16.7.8",
        "16.7.9",
        "20.0.0",
        "20.0.0b1",
        "20.0.0b2",
        "20.0.1",
        "20.0.10",
        "20.0.11",
        "20.0.12",
        "20.0.13",
        "20.0.14",
        "20.0.15",
        "20.0.16",
        "20.0.17",
        "20.0.18",
        "20.0.19",
        "20.0.2",
        "20.0.20",
        "20.0.21",
        "20.0.22",
        "20.0.23",
        "20.0.24",
        "20.0.25",
        "20.0.26",
        "20.0.27",
        "20.0.28",
        "20.0.29",
        "20.0.3",
        "20.0.30",
        "20.0.31",
        "20.0.32",
        "20.0.33",
        "20.0.34",
        "20.0.35",
        "20.0.4",
        "20.0.5",
        "20.0.6",
        "20.0.7",
        "20.0.8",
        "20.0.9",
        "20.1.0",
        "20.10.0",
        "20.11.0",
        "20.11.1",
        "20.11.2",
        "20.12.0",
        "20.12.1",
        "20.13.0",
        "20.13.1",
        "20.13.2",
        "20.13.3",
        "20.13.4",
        "20.14.0",
        "20.14.1",
        "20.15.0",
        "20.15.1",
        "20.16.0",
        "20.16.1",
        "20.16.2",
        "20.16.3",
        "20.16.4",
        "20.16.5",
        "20.16.6",
        "20.16.7",
        "20.17.0",
        "20.17.1",
        "20.18.0",
        "20.19.0",
        "20.2.0",
        "20.2.1",
        "20.2.2",
        "20.20.0",
        "20.21.0",
        "20.21.1",
        "20.22.0",
        "20.23.0",
        "20.23.1",
        "20.24.0",
        "20.24.1",
        "20.24.2",
        "20.24.3",
        "20.24.4",
        "20.24.5",
        "20.24.6",
        "20.24.7",
        "20.25.0",
        "20.25.1",
        "20.25.2",
        "20.25.3",
        "20.26.0",
        "20.26.1",
        "20.26.2",
        "20.26.3",
        "20.26.4",
        "20.26.5",
        "20.26.6",
        "20.27.0",
        "20.27.1",
        "20.28.0",
        "20.28.1",
        "20.29.0",
        "20.29.1",
        "20.29.2",
        "20.29.3",
        "20.3.0",
        "20.3.1",
        "20.30.0",
        "20.31.0",
        "20.31.1",
        "20.31.2",
        "20.32.0",
        "20.33.0",
        "20.33.1",
        "20.34.0",
        "20.35.0",
        "20.35.1",
        "20.35.2",
        "20.35.3",
        "20.35.4",
        "20.36.0",
        "20.36.1",
        "20.38.0",
        "20.39.0",
        "20.39.1",
        "20.4.0",
        "20.4.1",
        "20.4.2",
        "20.4.3",
        "20.4.4",
        "20.4.5",
        "20.4.6",
        "20.4.7",
        "20.5.0",
        "20.6.0",
        "20.7.0",
        "20.7.1",
        "20.7.2",
        "20.8.0",
        "20.8.1",
        "20.9.0",
        "21.0.0",
        "21.1.0",
        "21.2.0",
        "21.2.1",
        "21.2.2",
        "21.2.3",
        "21.2.4",
        "21.3.0",
        "21.3.1",
        "21.3.2",
        "21.3.3",
        "21.4.0",
        "21.4.1",
        "21.4.2",
        "21.4.3",
        "21.5.0",
        "21.5.1",
        "21.5.2",
        "21.6.0",
        "21.6.1",
        "21.7.0",
        "21.7.1",
        "21.7.10",
        "21.7.11",
        "21.7.2",
        "21.7.3",
        "21.7.4",
        "21.7.5",
        "21.7.6",
        "21.7.7",
        "21.7.8",
        "21.7.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-102937",
    "GHSA-x78j-v8h9-3j2q"
  ],
  "credits": [
    {
      "name": "Bern\u00e1t G\u00e1bor",
      "type": "FINDER"
    }
  ],
  "details": "`BatchActivator.quote()` returned its input unchanged, the only activator with\nno escaping at all. `--prompt`, the `VIRTUALENV_PROMPT` environment variable,\nand the config file all set the prompt, and `activate.bat` writes it straight\ninto `@set \"VAR=value\"`. A prompt containing a double quote closes that string\nearly, and whatever follows runs as live cmd.exe syntax. For example, a venv\ncreated with `--prompt \u0027x\" \u0026 calc \u0026 \"\u0027` runs `calc` the moment someone runs\n`activate.bat`.\n\nAnyone who templates a prompt from untrusted input (a CI job using a branch\nname, a wrapper script deriving an environment name from user input) hands an\nattacker code execution in the shell of anyone who activates the resulting venv\non Windows.\n\nFixed in 21.7.12 by escaping the characters cmd.exe treats as live syntax\ninside this construct.\n",
  "id": "PYSEC-2026-4014",
  "modified": "2026-09-30T16:13:20.593341Z",
  "published": "2026-09-18T01:41:45Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pypa/virtualenv/security/advisories/GHSA-x78j-v8h9-3j2q"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/virtualenv/pull/3250"
    },
    {
      "type": "FIX",
      "url": "https://github.com/pypa/virtualenv/commit/d721ff140ce4afdc2a9b76751e4584e25d9fbea6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/virtualenv/releases/tag/21.7.12"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pypa/virtualenv"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/virtualenv"
    }
  ],
  "summary": "Command injection via --prompt in activate.bat (batch activator)"
}