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5.8 Medium

CVE-2026-102938 virtualenv is a tool for creating isolated virtual python environments

Description

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 and versions

Product Affected versions Fixed in
virtualenv 21.7 earliest → < 21.7.11 21.7.11

References

Timeline

  1. Published
  2. Last modified

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