{"id":"CVE-2026-115586","state":"PUBLISHED","title":"virtualenv: Bash activator leaves the --prompt value unescaped in PS1 when promptvars is off, so prompt expansion later executes it (regression in 21.14.9)","description":"virtualenv is a tool for creating isolated virtual python environments. From 21.14.9 until 21.14.13, the bash bin/activate script can copy an attacker-controlled --prompt value into PS1 without escaping dollar signs or backticks when both promptvars and POSIX mode are disabled during activation. Re-enabling promptvars, running set -o posix, or starting an interactive child bash that inherits the exported PS1 can then expand command substitution in the stored VIRTUAL_ENV_PROMPT value and execute commands as the user who activates the environment. This issue is fixed in version 21.14.13.","publishedAt":"2026-10-23T19:34:46.391Z","updatedAt":"2026-10-23T20:55:42.764Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["pypa virtualenv"],"affected":[{"vendor":"pypa","product":"virtualenv","versions":[{"version":">= 21.14.9, < 21.14.13","status":"affected"}]}],"references":["https://github.com/pypa/virtualenv/security/advisories/GHSA-cx6f-vjhg-g3cc","https://github.com/pypa/virtualenv/pull/3466","https://github.com/pypa/virtualenv/commit/3598e201f6f044e389136b2347a8a919ac03c5f4","https://github.com/pypa/virtualenv/releases/tag/21.14.13"],"weaknesses":["CWE-78"],"ingestedAt":"2026-10-29T20:10:43.281Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/115xxx/CVE-2026-115586.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-115586","state":"PUBLISHED","datePublished":"2026-10-23T19:34:46.391Z","dateUpdated":"2026-10-23T20:55:42.764Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-22T22:53:15.239Z"},"containers":{"cna":{"title":"virtualenv: Bash activator leaves the --prompt value unescaped in PS1 when promptvars is off, so prompt expansion later executes it (regression in 21.14.9)","descriptions":[{"lang":"en","value":"virtualenv is a tool for creating isolated virtual python environments. From 21.14.9 until 21.14.13, the bash bin/activate script can copy an attacker-controlled --prompt value into PS1 without escaping dollar signs or backticks when both promptvars and POSIX mode are disabled during activation. Re-enabling promptvars, running set -o posix, or starting an interactive child bash that inherits the exported PS1 can then expand command substitution in the stored VIRTUAL_ENV_PROMPT value and execute commands as the user who activates the environment. This issue is fixed in version 21.14.13."}],"affected":[{"vendor":"pypa","product":"virtualenv","versions":[{"version":">= 21.14.9, < 21.14.13","status":"affected"}]}],"references":[{"url":"https://github.com/pypa/virtualenv/security/advisories/GHSA-cx6f-vjhg-g3cc","name":"https://github.com/pypa/virtualenv/security/advisories/GHSA-cx6f-vjhg-g3cc","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/pypa/virtualenv/pull/3466","name":"https://github.com/pypa/virtualenv/pull/3466","tags":["x_refsource_MISC"]},{"url":"https://github.com/pypa/virtualenv/commit/3598e201f6f044e389136b2347a8a919ac03c5f4","name":"https://github.com/pypa/virtualenv/commit/3598e201f6f044e389136b2347a8a919ac03c5f4","tags":["x_refsource_MISC"]},{"url":"https://github.com/pypa/virtualenv/releases/tag/21.14.13","name":"https://github.com/pypa/virtualenv/releases/tag/21.14.13","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.1,"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-78","lang":"en","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-23T19:34:46.391Z"},"source":{"advisory":"GHSA-cx6f-vjhg-g3cc","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-23T20:45:48.701499Z","id":"CVE-2026-115586","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-23T20:55:42.764Z"}}]}}}