{"id":"CVE-2026-102937","summary":"virtualenv: Command injection via --prompt in activate.bat (batch activator)","details":"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.","aliases":["GHSA-x78j-v8h9-3j2q","PYSEC-2026-4014"],"modified":"2026-09-30T16:55:51.995833724Z","published":"2026-09-29T20:56:13.998Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-78"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102937.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102937.json"},{"type":"FIX","url":"https://github.com/pypa/virtualenv/commit/d721ff140ce4afdc2a9b76751e4584e25d9fbea6"},{"type":"FIX","url":"https://github.com/pypa/virtualenv/pull/3250"},{"type":"WEB","url":"https://github.com/pypa/virtualenv/releases/tag/21.7.12"},{"type":"ADVISORY","url":"https://github.com/pypa/virtualenv/security/advisories/GHSA-x78j-v8h9-3j2q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102937"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/pypa/virtualenv","events":[{"introduced":"0"},{"fixed":"9666b42afc8d6103e765d77958d7bae782f5406e"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"21.7.12"}],"source":"AFFECTED_FIELD"}}],"versions":["21.7.11","21.7.10","21.7.9","21.7.8","21.7.7","21.7.6","21.7.5","21.7.4","21.7.3","21.7.2","21.7.1","21.7.0","21.6.1","21.6.0","21.5.2","21.5.1","21.5.0","21.4.3","21.4.2","21.4.1","21.4.0","21.3.3","21.3.2","21.3.1","21.3.0","21.2.4","21.2.3","21.2.2","21.2.1","21.2.0","21.1.0","21.0.0","20.39.1","20.39.0","20.38.0","20.37.0","20.27.3","20.27.2","20.24.3","20.3.0","20.0.32","20.0.7","20.0.0b2","20.0.0b1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102937.json"}}],"schema_version":"1.9.0","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"}]}