CVE-2026-102938: Pypa Virtualenv

Medium severity, CVSS 5.8. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Pypa Virtualenv: before 21.7.11 (fixed in 21.7.11)

Published 2026-09-29. Last modified 2026-09-30.