{"id":"UBUNTU-CVE-2026-102938","details":"virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.11, PyEnvCfg.write() writes prompt values verbatim to the line-oriented pyvenv.cfg format while PyEnvCfg._read_values() parses the file with str.splitlines() and accepts the last value for duplicate keys. An attacker who influences --prompt, VIRTUALENV_PROMPT, or configuration input can insert a recognized line boundary and additional keys, including home, causing consumers to use an attacker-selected base interpreter or corrupted environment metadata. The security impact requires prompt input from outside the operator's trust boundary; directly supplied prompt content primarily corrupts the operator's own environment. This issue is fixed in version 21.7.11.","modified":"2026-10-01T00:26:12.174632165Z","published":"2026-09-29T21:17:00Z","upstream":["CVE-2026-102938"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-102938"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-102938"},{"type":"REPORT","url":"https://github.com/pypa/virtualenv/commit/a30f995461043acb6cacbf3a890951563ccf7140"},{"type":"REPORT","url":"https://github.com/pypa/virtualenv/pull/3247"},{"type":"REPORT","url":"https://github.com/pypa/virtualenv/releases/tag/21.7.11"},{"type":"REPORT","url":"https://github.com/pypa/virtualenv/security/advisories/GHSA-9h9j-4vrj-gf7g"}],"affected":[{"package":{"name":"python-virtualenv","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/python-virtualenv?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":"1.11.4-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102938.json"}},{"package":{"name":"python-virtualenv","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/python-virtualenv?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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_version":"15.0.1+ds-3ubuntu1.1","binary_name":"python-virtualenv"},{"binary_version":"15.0.1+ds-3ubuntu1.1","binary_name":"python3-virtualenv"},{"binary_name":"virtualenv","binary_version":"15.0.1+ds-3ubuntu1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102938.json"}},{"package":{"name":"python-virtualenv","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python-virtualenv?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["15.1.0+ds-1","15.1.0+ds-1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"python-virtualenv","binary_version":"15.1.0+ds-1.1"},{"binary_version":"15.1.0+ds-1.1","binary_name":"python3-virtualenv"},{"binary_name":"virtualenv","binary_version":"15.1.0+ds-1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102938.json"}},{"package":{"name":"python-virtualenv","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/python-virtualenv?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":"20.0.17-1ubuntu0.4+esm1"},{"binary_name":"virtualenv","binary_version":"20.0.17-1ubuntu0.4+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102938.json"}},{"package":{"name":"python-virtualenv","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/python-virtualenv?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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_version":"20.13.0+ds-2ubuntu0.1~esm1","binary_name":"python3-virtualenv"},{"binary_name":"virtualenv","binary_version":"20.13.0+ds-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102938.json"}},{"package":{"name":"python-virtualenv","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/python-virtualenv?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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_version":"20.25.0+ds-2ubuntu0.1~esm1","binary_name":"python3-virtualenv"},{"binary_name":"virtualenv","binary_version":"20.25.0+ds-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-102938.json"}},{"package":{"name":"python-virtualenv","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/python-virtualenv?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["20.31.2+ds-1","20.35.3+ds-1","20.35.4+ds-1","20.36.1+ds-1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-virtualenv","binary_version":"20.36.1+ds-1"},{"binary_version":"20.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