{"id":"BIT-virtualenv-2026-102938","summary":"virtualenv writes prompt values into pyvenv.cfg without sanitizing line boundaries, allowing configuration injection","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.","aliases":["CVE-2026-102938","GHSA-9h9j-4vrj-gf7g","PYSEC-2026-4012"],"modified":"2026-10-06T15:25:56.172772842Z","published":"2026-10-06T11:57:39.681Z","database_specific":{"cpes":["cpe:2.3:a:virtualenv:virtualenv:*:*:*:*:*:python:*:*"],"severity":"Medium"},"references":[{"type":"WEB","url":"https://github.com/pypa/virtualenv/commit/a30f995461043acb6cacbf3a890951563ccf7140"},{"type":"WEB","url":"https://github.com/pypa/virtualenv/pull/3247"},{"type":"WEB","url":"https://github.com/pypa/virtualenv/releases/tag/21.7.11"},{"type":"WEB","url":"https://github.com/pypa/virtualenv/security/advisories/GHSA-9h9j-4vrj-gf7g"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102938"}],"affected":[{"package":{"name":"virtualenv","ecosystem":"Bitnami","purl":"pkg:bitnami/virtualenv"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"21.7.11"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/virtualenv/BIT-virtualenv-2026-102938.json"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}],"schema_version":"1.9.0"}