virtualenv: Xonsh activation literals depend on the script decoding codec

{
  "id": "29f1c1b0959deb7e1c8be1605603bbd062659945cdcbcfcaa89f96dfd12b8f02",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-113718",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "virtualenv: Xonsh activation literals depend on the script decoding codec",
    "summary": "virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, POSIX xonsh activation quote() uses repr() to write printable non-ASCII prompt or destination data into UTF-8 activate.xsh, while xonsh can read that script using $XONSH_ENCODING. Under a legacy multibyte codec such as GBK or Big5, a UTF-8 trail byte can consume the backslash before an adjacent quote, allowing the literal to close and attacker-influenced statements to execute when the user sources the generated script. This issue is fixed in version 21.14.9.",
    "evidence": "cve:CVE-2026-113718",
    "products": [
      {
        "name": {
          "value": "virtualenv",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-113718",
      "aliases": [
        "CVE-2026-113718"
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 7.1,
            "attackVector": "LOCAL",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "userInteraction": "ACTIVE",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "privilegesRequired": "NONE",
            "subIntegrityImpact": "NONE",
            "vulnIntegrityImpact": "HIGH",
            "subAvailabilityImpact": "NONE",
            "vulnAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH"
          }
        }
      ],
      "affected": [
        {
          "vendor": "pypa",
          "product": "virtualenv",
          "versions": [
            {
              "status": "affected",
              "version": "< 21.14.9"
            }
          ]
        }
      ],
      "modified": "2026-10-27T13:33:36.583Z",
      "provider": "cve",
      "references": [
        "https://github.com/pypa/virtualenv/security/advisories/GHSA-394h-qwmc-48pf",
        "https://github.com/pypa/virtualenv/pull/3432",
        "https://github.com/pypa/virtualenv/commit/e5fc2e6e189a877ff559af288919e3525d13e5e0",
        "https://github.com/pypa/virtualenv/releases/tag/21.14.9"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-113718",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-27T13:33:30.399430Z"
                  }
                }
              }
            ],
            "references": [
              {
                "url": "https://github.com/pypa/virtualenv/security/advisories/GHSA-394h-qwmc-48pf",
                "tags": [
                  "exploit"
                ]
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-27T13:33:36.583Z"
            }
          }
        ],
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-20T19:39:52.633Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-113718",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 392600,
  "published_at": "2026-10-20T19:39:52.633+00:00"
}