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7.8 High

virtualenv is a tool for creating isolated virtual python environments.

CVE-2026-102925

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 VIRTUALENV when a relocated environment's recorded directory is absent; in the fish script, crafted Tcl or Tk library paths reach TCLLIBRARY or TKLIBRARY. 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.

Assessment

CVSS
7.8 (v3.1)
Severity
High
EPSS
0.16% chance of exploitation in the next 30 days
Known exploited
Not listed in CISA KEV
Exploit availability
Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published
29 September 2026
Last updated
30 September 2026
Affected
pypa · virtualenv
Weakness
CWE-78
Assigner
security-advisories@github.com

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

At the source

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