CVE-2026-102938
Published:September 29, 2026
Updated:October 10, 2026
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 Packages
virtualenv (CONDA):
Affected version(s) >=20.0.20 <21.7.11Fix Suggestion:
Update to version 21.7.11https://github.com/pypa/virtualenv.git (GITHUB):
Affected version(s) >=20.0.0 <21.7.11Fix Suggestion:
Update to version 21.7.11virtualenv (PYTHON):
Affected version(s) >=0.8 <21.7.11Fix Suggestion:
Update to version 21.7.11virtualenv (PYTHON):
Affected version(s) >=20.0.0 <21.7.11Fix Suggestion:
Update to version 21.7.11Related Resources (9)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.8
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.6
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Improper Neutralization of CRLF Sequences ('CRLF Injection')
EPSS
Base Score:
0.14