CVE-2026-102925
Published:September 29, 2026
Updated:October 11, 2026
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.13, the generated activate (bash and zsh) and activate.fish scripts place values already escaped by shlex.quote inside an additional quoted context. In the bash and zsh script, a crafted virtual environment path reaches VIRTUAL_ENV when a relocated environment's recorded directory is absent; in the fish script, crafted Tcl or Tk library paths reach TCL_LIBRARY or TK_LIBRARY. The surplus quotes can terminate the data-only quoted run and leave shell metacharacters parsed as commands when a user sources the activation script, allowing code execution with that user's privileges. This issue is fixed in version 21.7.13.
Affected Packages
virtualenv (CONDA):
Affected version(s) >=20.33.0 <21.7.13Fix Suggestion:
Update to version 21.7.13https://github.com/pypa/virtualenv.git (GITHUB):
Affected version(s) >=20.33.0 <21.7.13Fix Suggestion:
Update to version 21.7.13virtualenv (PYTHON):
Affected version(s) >=20.33.0 <21.7.13Fix Suggestion:
Update to version 21.7.13virtualenv (PYTHON):
Affected version(s) >=0.8 <21.7.13Fix Suggestion:
Update to version 21.7.13Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (9)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.5
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.8
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
EPSS
Base Score:
0.15