Vulnerability-Lookup

UBUNTU-CVE-2026-113720 (CVE-2026-113720)

Vulnerability from osv_ubuntu – Published: 2026-10-20 20:17 – Updated: 2026-10-28 17:50 – Source website

Details

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the app-data copy seeder uses shutil.copy() to copy cached package files into later environments, causing cached source modes to override the current run's umask. A cache populated under a permissive umask can therefore produce files writable by another local account in a later traversable environment, allowing package code such as pip/init.py to be modified and executed by the environment owner. The attacker cannot force the earlier umask, and a private destination parent prevents access. This issue is fixed in version 21.14.9.

Severity

4.4 (Medium)


                    
                      CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-113720	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-113720	REPORT
	https://github.com/pypa/virtualenv/security/advis…	REPORT
	https://github.com/pypa/virtualenv/pull/3425	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-virtualenv",
            "binary_version": "1.11.4-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "python-virtualenv",
        "purl": "pkg:deb/ubuntu/python-virtualenv@1.11.4-1ubuntu1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.1-1",
        "1.11-1",
        "1.11-2",
        "1.11.4-1",
        "1.11.4-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-virtualenv",
            "binary_version": "15.0.1+ds-3ubuntu1.1"
          },
          {
            "binary_name": "python3-virtualenv",
            "binary_version": "15.0.1+ds-3ubuntu1.1"
          },
          {
            "binary_name": "virtualenv",
            "binary_version": "15.0.1+ds-3ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "python-virtualenv",
        "purl": "pkg:deb/ubuntu/python-virtualenv@15.0.1+ds-3ubuntu1.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.11.6+ds-1",
        "14.0.5+ds-1",
        "14.0.5+ds-2",
        "14.0.5+ds-4",
        "15.0.0+ds-1",
        "15.0.0+ds-2",
        "15.0.1+ds-1",
        "15.0.1+ds-2",
        "15.0.1+ds-3",
        "15.0.1+ds-3ubuntu1",
        "15.0.1+ds-3ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-virtualenv",
            "binary_version": "15.1.0+ds-1.1"
          },
          {
            "binary_name": "python3-virtualenv",
            "binary_version": "15.1.0+ds-1.1"
          },
          {
            "binary_name": "virtualenv",
            "binary_version": "15.1.0+ds-1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "python-virtualenv",
        "purl": "pkg:deb/ubuntu/python-virtualenv@15.1.0+ds-1.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "15.1.0+ds-1",
        "15.1.0+ds-1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-virtualenv",
            "binary_version": "20.0.17-1ubuntu0.4+esm1"
          },
          {
            "binary_name": "virtualenv",
            "binary_version": "20.0.17-1ubuntu0.4+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "python-virtualenv",
        "purl": "pkg:deb/ubuntu/python-virtualenv@20.0.17-1ubuntu0.4+esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "15.1.0+ds-2",
        "15.1.0+ds-2build1",
        "15.1.0+ds-2ubuntu1",
        "20.0.13-1",
        "20.0.17-1",
        "20.0.17-1ubuntu0.3",
        "20.0.17-1ubuntu0.4",
        "20.0.17-1ubuntu0.4+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-virtualenv",
            "binary_version": "20.13.0+ds-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "virtualenv",
            "binary_version": "20.13.0+ds-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "python-virtualenv",
        "purl": "pkg:deb/ubuntu/python-virtualenv@20.13.0+ds-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.4.6+ds-2",
        "20.10.0+ds-1",
        "20.12.1+ds-1",
        "20.13.0+ds-1",
        "20.13.0+ds-2",
        "20.13.0+ds-2ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-virtualenv",
            "binary_version": "20.25.0+ds-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "virtualenv",
            "binary_version": "20.25.0+ds-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "python-virtualenv",
        "purl": "pkg:deb/ubuntu/python-virtualenv@20.25.0+ds-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.24.1+ds-1",
        "20.24.6+ds-1",
        "20.24.6+ds-2",
        "20.25.0+ds-1",
        "20.25.0+ds-2",
        "20.25.0+ds-2ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-virtualenv",
            "binary_version": "21.5.1+ds-1"
          },
          {
            "binary_name": "virtualenv",
            "binary_version": "21.5.1+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "python-virtualenv",
        "purl": "pkg:deb/ubuntu/python-virtualenv@21.5.1+ds-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.36.1+ds-1",
        "21.4.1+ds-1",
        "21.5.1+ds-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-virtualenv",
            "binary_version": "20.36.1+ds-1"
          },
          {
            "binary_name": "virtualenv",
            "binary_version": "20.36.1+ds-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "python-virtualenv",
        "purl": "pkg:deb/ubuntu/python-virtualenv@20.36.1+ds-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.31.2+ds-1",
        "20.35.3+ds-1",
        "20.35.4+ds-1",
        "20.36.1+ds-1"
      ]
    }
  ],
  "aliases": [],
  "details": "virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the app-data copy seeder uses shutil.copy() to copy cached package files into later environments, causing cached source modes to override the current run\u0027s umask. A cache populated under a permissive umask can therefore produce files writable by another local account in a later traversable environment, allowing package code such as pip/__init__.py to be modified and executed by the environment owner. The attacker cannot force the earlier umask, and a private destination parent prevents access. This issue is fixed in version 21.14.9.",
  "id": "UBUNTU-CVE-2026-113720",
  "modified": "2026-10-28T17:50:37Z",
  "published": "2026-10-20T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-113720"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-113720"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pypa/virtualenv/security/advisories/GHSA-fc2g-4w5p-6whm"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/pypa/virtualenv/pull/3425"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-113720"
  ]
}

CVE-2026-113720 (GCVE-0-2026-113720)

Vulnerability from cvelistv5 – Published: 2026-10-20 19:43 – Updated: 2026-10-21 15:52

Title

virtualenv: Seeded files retain permissions from an older cache

Summary

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the app-data copy seeder uses shutil.copy() to copy cached package files into later environments, causing cached source modes to override the current run's umask. A cache populated under a permissive umask can therefore produce files writable by another local account in a later traversable environment, allowing package code such as pip/__init__.py to be modified and executed by the environment owner. The attacker cannot force the earlier umask, and a private destination parent prevents access. This issue is fixed in version 21.14.9.

Severity

4.4 (Medium)


                        
                          CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-21 14:24 UTC

CWE

CWE-732 - Incorrect Permission Assignment for Critical Resource

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8129 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/pypa/virtualenv/security/advis…	x_refsource_CONFIRM
https://github.com/pypa/virtualenv/pull/3425	x_refsource_MISC
https://github.com/pypa/virtualenv/commit/35f0b33…	x_refsource_MISC
https://github.com/pypa/virtualenv/releases/tag/21.14.9	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pypa	virtualenv	Affected: < 21.14.9

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-113720",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-21T14:24:43.461629Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-21T15:52:33.658Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "virtualenv",
          "vendor": "pypa",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 21.14.9"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, the app-data copy seeder uses shutil.copy() to copy cached package files into later environments, causing cached source modes to override the current run\u0027s umask. A cache populated under a permissive umask can therefore produce files writable by another local account in a later traversable environment, allowing package code such as pip/__init__.py to be modified and executed by the environment owner. The attacker cannot force the earlier umask, and a private destination parent prevents access. This issue is fixed in version 21.14.9."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-732",
              "description": "CWE-732: Incorrect Permission Assignment for Critical Resource",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-20T19:43:32.451Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pypa/virtualenv/security/advisories/GHSA-fc2g-4w5p-6whm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pypa/virtualenv/security/advisories/GHSA-fc2g-4w5p-6whm"
        },
        {
          "name": "https://github.com/pypa/virtualenv/pull/3425",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pypa/virtualenv/pull/3425"
        },
        {
          "name": "https://github.com/pypa/virtualenv/commit/35f0b33562790176dd186d0a3c517af3acc7a0e1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pypa/virtualenv/commit/35f0b33562790176dd186d0a3c517af3acc7a0e1"
        },
        {
          "name": "https://github.com/pypa/virtualenv/releases/tag/21.14.9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pypa/virtualenv/releases/tag/21.14.9"
        }
      ],
      "source": {
        "advisory": "GHSA-fc2g-4w5p-6whm",
        "discovery": "UNKNOWN"
      },
      "title": "virtualenv: Seeded files retain permissions from an older cache"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-113720",
    "datePublished": "2026-10-20T19:43:32.451Z",
    "dateReserved": "2026-10-20T16:03:14.863Z",
    "dateUpdated": "2026-10-21T15:52:33.658Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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